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Schwarz TM, Yang J, Aota LS, Woods E, Zhou X, Neugebauer J, Todorova M, McCarroll I, Gault B. Quasi-"In Situ" Analysis of the Reactive Liquid-Solid Interface during Magnesium Corrosion Using Cryo-Atom Probe Tomography. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2024; 36:e2401735. [PMID: 38813786 DOI: 10.1002/adma.202401735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2024] [Revised: 05/23/2024] [Indexed: 05/31/2024]
Abstract
The early stages of corrosion occurring at liquid-solid interfaces control the evolution of the material's degradation process, yet due to their transient state, their analysis remains a formidable challenge. Here corrosion tests are performed on a MgCa alloy, a candidate material for biodegradable implants using pure water as a model system. The corrosion reaction is suspended by plunge freezing into liquid nitrogen. The evolution of the early-stage corrosion process on the nanoscale by correlating cryo-atom probe tomography (APT) with transmission-electron microscopy (TEM) and spectroscopy, is studied. The outward growth of Mg hydroxide Mg(OH)2 and the inward growth of an intermediate corrosion layer consisting of hydrloxides of different compositions, mostly monohydroxide Mg(OH) instead of the expected MgO layer, are observed. In addition, Ca partitions to these newly formed hydroxides and oxides. Density-functional theory calculations suggest a domain of stability for this previously experimental unreported Mg(OH) phase. This new approach and these new findings advance the understanding of the early stages of magnesium corrosion, and in general reactions and processes at liquid-solid interfaces, which can further facilitate the development of corrosion-resistant materials or better control of the biodegradation rate of future implants.
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Affiliation(s)
- Tim M Schwarz
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237, Düsseldorf, Germany
| | - Jing Yang
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237, Düsseldorf, Germany
| | - Leonardo S Aota
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237, Düsseldorf, Germany
| | - Eric Woods
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237, Düsseldorf, Germany
| | - Xuyang Zhou
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237, Düsseldorf, Germany
| | - Jörg Neugebauer
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237, Düsseldorf, Germany
| | - Mira Todorova
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237, Düsseldorf, Germany
| | - Ingrid McCarroll
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237, Düsseldorf, Germany
| | - Baptiste Gault
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, 40237, Düsseldorf, Germany
- Department of Materials, Imperial College London, London, SW7 2AZ, UK
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2
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Tegg L, McCarroll IE, Kim SH, Dubosq R, Woods EV, El-Zoka AA, Gault B, Cairney JM. Analysis of Water Ice in Nanoporous Copper Needles Using Cryo Atom Probe Tomography. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2024:ozae062. [PMID: 39027931 DOI: 10.1093/mam/ozae062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Revised: 05/23/2024] [Accepted: 06/23/2024] [Indexed: 07/20/2024]
Abstract
The application of atom probe tomography (APT) to frozen liquids is limited by difficulties in specimen preparation. Here, we report on the use of nanoporous Cu needles as a physical framework to hold water ice for investigation using APT. Nanoporous Cu needles are prepared by electropolishing and dealloying Cu-Mn matchstick precursors. Cryogenic scanning electron microscopy and focused ion beam milling reveal a hierarchical, dendritic, highly wettable microstructure. The atom probe mass spectrum is dominated by peaks of Cu+ and H(H2O)n+ up to n ≤ 3, and the reconstructed volume shows the protrusion of a Cu ligament into an ice-filled pore. The continuous Cu ligament network electrically connects the apex to the cryostage, leading to an enhanced electric field at the apex and increased cooling, both of which simplify the mass spectrum compared to previous reports.
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Affiliation(s)
- Levi Tegg
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Camperdown, New South Wales 2006, Australia
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Camperdown, New South Wales 2006, Australia
| | - Ingrid E McCarroll
- Department of Microstructure Physics and Alloy Design,Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
| | - Se-Ho Kim
- Department of Microstructure Physics and Alloy Design,Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
- Department of Materials Science and Engineering, Korea University, 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Renelle Dubosq
- Department of Microstructure Physics and Alloy Design,Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
| | - Eric V Woods
- Department of Microstructure Physics and Alloy Design,Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
| | - Ayman A El-Zoka
- Department of Microstructure Physics and Alloy Design,Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
- Department of Materials, Royal School of Mines, Imperial College London, Exhibition Road, London SW7 2AZ, UK
| | - Baptiste Gault
- Department of Microstructure Physics and Alloy Design,Max-Planck-Institut für Eisenforschung, Max-Planck-Straße 1, 40237 Düsseldorf, Germany
- Department of Materials, Royal School of Mines, Imperial College London, Exhibition Road, London SW7 2AZ, UK
| | - Julie M Cairney
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Camperdown, New South Wales 2006, Australia
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Camperdown, New South Wales 2006, Australia
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Exertier F, Tegg L, Taylor A, Cairney JM, Fu J, Marceau RKW. Nanoscale Analysis of Frozen Water by Atom Probe Tomography Using Graphene Encapsulation and Cryo-Workflows. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2024:ozae054. [PMID: 38905154 DOI: 10.1093/mam/ozae054] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2023] [Revised: 04/24/2024] [Accepted: 05/28/2024] [Indexed: 06/23/2024]
Abstract
There has been an increasing interest in atom probe tomography (APT) to characterize hydrated and biological materials. A major benefit of APT compared to microscopy techniques more commonly used in biology is its combination of outstanding three-dimensional (3D) spatial resolution and mass sensitivity. APT has already been successfully used to characterize biominerals, revealing key structural information at the atomic scale, however there are many challenges inherent to the analysis of soft hydrated materials. New preparation protocols, often involving specimen preparation and transfer at cryogenic temperature, enable APT analysis of hydrated materials and have the potential to enable 3D atomic scale characterization of biological materials in the near-native hydrated state. In this study, samples of pure water at the tips of tungsten needle specimens were prepared at room temperature by graphene encapsulation. A comparative study was conducted where specimens were transferred at either room temperature or cryo-temperature and analyzed by APT by varying the flight path and pulsing mode. The differences between the analysis workflows are presented along with recommendations for future studies, and the compatibility between graphene coating and cryogenic workflows is demonstrated.
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Affiliation(s)
- Florant Exertier
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
| | - Levi Tegg
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, NSW 2006, Australia
| | - Adam Taylor
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
| | - Julie M Cairney
- School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, NSW 2006, Australia
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, NSW 2006, Australia
| | - Jing Fu
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Ross K W Marceau
- Institute for Frontier Materials, Deakin University, Geelong, VIC 3216, Australia
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Woods EV, Saksena A, El-Zoka AA, Stephenson LT, Schwarz TM, Singh MP, Aota LS, Kim SH, Schneider J, Gault B. Nanoporous Gold Thin Films as Substrates to Analyze Liquids by Cryo-atom Probe Tomography. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2024:ozae041. [PMID: 38833315 DOI: 10.1093/mam/ozae041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Revised: 03/09/2024] [Accepted: 04/24/2024] [Indexed: 06/06/2024]
Abstract
Cryogenic atom probe tomography (cryo-APT) is being developed to enable nanoscale compositional analyses of frozen liquids. Yet, the availability of readily available substrates that allow for the fixation of liquids while providing sufficient strength to their interface is still an issue. Here, we propose the use of 1-2-µm-thick binary alloy film of gold-silver sputtered onto flat silicon, with sufficient adhesion without an additional layer. Through chemical dealloying, we successfully fabricate a nanoporous substrate, with an open-pore structure, which is mounted on a microarray of Si posts by lift-out in the focused-ion beam system, allowing for cryogenic fixation of liquids. We present cryo-APT results obtained after cryogenic sharpening, vacuum cryo-transfer, and analysis of pure water on the top and inside the nanoporous film. We demonstrate that this new substrate has the requisite characteristics for facilitating cryo-APT of frozen liquids, with a relatively lower volume of precious metals. This complete workflow represents an improved approach for frozen liquid analysis, from preparation of the films to the successful fixation of the liquid in the porous network, to cryo-APT.
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Affiliation(s)
- Eric V Woods
- Max-Planck-Institut für Eisenforschung, Mikrostrukturphysik und Legierungsdesign, Max-Planck-Str. 1, Düsseldorf, Germany
| | - Aparna Saksena
- Max-Planck-Institut für Eisenforschung, Mikrostrukturphysik und Legierungsdesign, Max-Planck-Str. 1, Düsseldorf, Germany
| | - Ayman A El-Zoka
- Max-Planck-Institut für Eisenforschung, Mikrostrukturphysik und Legierungsdesign, Max-Planck-Str. 1, Düsseldorf, Germany
- Department of Materials, Royal School of Mines, Imperial College London, Prince Consort Road, London SW7 2BP, UK
| | - Leigh T Stephenson
- Max-Planck-Institut für Eisenforschung, Mikrostrukturphysik und Legierungsdesign, Max-Planck-Str. 1, Düsseldorf, Germany
| | - Tim M Schwarz
- Max-Planck-Institut für Eisenforschung, Mikrostrukturphysik und Legierungsdesign, Max-Planck-Str. 1, Düsseldorf, Germany
| | - Mahander P Singh
- Max-Planck-Institut für Eisenforschung, Mikrostrukturphysik und Legierungsdesign, Max-Planck-Str. 1, Düsseldorf, Germany
| | - Leonardo S Aota
- Max-Planck-Institut für Eisenforschung, Mikrostrukturphysik und Legierungsdesign, Max-Planck-Str. 1, Düsseldorf, Germany
| | - Se-Ho Kim
- Max-Planck-Institut für Eisenforschung, Mikrostrukturphysik und Legierungsdesign, Max-Planck-Str. 1, Düsseldorf, Germany
| | - Jochen Schneider
- Materials Chemistry, RWTH Aachen University, Kopernikusstrasse. 10, 52074 Aachen, Germany
| | - Baptiste Gault
- Max-Planck-Institut für Eisenforschung, Mikrostrukturphysik und Legierungsdesign, Max-Planck-Str. 1, Düsseldorf, Germany
- Department of Materials, Royal School of Mines, Imperial College London, Prince Consort Road, London SW7 2BP, UK
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Woods EV, Singh MP, Kim SH, Schwarz TM, Douglas JO, El-Zoka AA, Giulani F, Gault B. A Versatile and Reproducible Cryo-sample Preparation Methodology for Atom Probe Studies. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2023; 29:1992-2003. [PMID: 37856778 DOI: 10.1093/micmic/ozad120] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2023] [Revised: 08/14/2023] [Accepted: 10/01/2023] [Indexed: 10/21/2023]
Abstract
Repeatable and reliable site-specific preparation of specimens for atom probe tomography (APT) at cryogenic temperatures has proven challenging. A generalized workflow is required for cryogenic specimen preparation including lift-out via focused ion beam and in situ deposition of capping layers, to strengthen specimens that will be exposed to high electric field and stresses during field evaporation in APT and protect them from environment during transfer into the atom probe. Here, we build on existing protocols and showcase preparation and analysis of a variety of metals, oxides, and supported frozen liquids and battery materials. We demonstrate reliable in situ deposition of a metallic capping layer that significantly improves the atom probe data quality for challenging material systems, particularly battery cathode materials which are subjected to delithiation during the atom probe analysis itself. Our workflow design is versatile and transferable widely to other instruments.
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Affiliation(s)
- Eric V Woods
- Mikrostrukturphysik und Legierungsdesign, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
| | - Mahander P Singh
- Mikrostrukturphysik und Legierungsdesign, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
| | - Se-Ho Kim
- Mikrostrukturphysik und Legierungsdesign, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
| | - Tim M Schwarz
- Mikrostrukturphysik und Legierungsdesign, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
| | - James O Douglas
- Department of Materials, Royal School of Mines, Imperial College London, Prince Consort Road, London SW7 2BP, UK
| | - Ayman A El-Zoka
- Mikrostrukturphysik und Legierungsdesign, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
- Department of Materials, Royal School of Mines, Imperial College London, Prince Consort Road, London SW7 2BP, UK
| | - Finn Giulani
- Department of Materials, Royal School of Mines, Imperial College London, Prince Consort Road, London SW7 2BP, UK
| | - Baptiste Gault
- Mikrostrukturphysik und Legierungsdesign, Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
- Department of Materials, Royal School of Mines, Imperial College London, Prince Consort Road, London SW7 2BP, UK
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Woods EV, Kim SH, El-Zoka AA, Stephenson LT, Gault B. Scalable substrate development for aqueous sample preparation for atom probe tomography. J Microsc 2023. [PMID: 38115688 DOI: 10.1111/jmi.13255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 11/13/2023] [Accepted: 12/15/2023] [Indexed: 12/21/2023]
Abstract
Reliable and consistent preparation of atom probe tomography (APT) specimens from aqueous and hydrated biological specimens remains a significant challenge. One particularly difficult process step is the use of a focused ion beam (FIB) instrument for preparing the required needle-shaped specimen, typically involving a 'lift-out' procedure of a small sample of material. Here, two alternative substrate designs are introduced that enable using FIB only for sharpening, along with example APT datasets. The first design is a laser-cut FIB-style half-grid close to those used for transmission electron microscopy (TEM) that can be used in a grid holder compatible with APT pucks. The second design is a larger, standalone self-supporting substrate called a 'crown', with several specimen positions, which self-aligns in APT pucks, prepared by electrical discharge machining (EDM). Both designs are made nanoporous, to provide strength to the liquid-substrate interface, using chemical and vacuum dealloying. Alpha brass, a simple, widely available, lower-cost alternative to previously proposed substrates, was selected for this work. The resulting designs and APT data are presented and suggestions are provided to help drive wider community adoption.
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Affiliation(s)
- Eric V Woods
- Department Mikrostrukturphysik und Legierungsdesign, Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
| | - Se-Ho Kim
- Department Mikrostrukturphysik und Legierungsdesign, Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
- Department of Materials Science and Engineering, Korea University, Seoul, Republic of Korea
| | - Ayman A El-Zoka
- Department Mikrostrukturphysik und Legierungsdesign, Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
- Department of Materials, Royal School of Mines, Imperial College London, London, UK
| | - L T Stephenson
- Department Mikrostrukturphysik und Legierungsdesign, Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, New South Wales, Australia
| | - B Gault
- Department Mikrostrukturphysik und Legierungsdesign, Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
- Department of Materials, Royal School of Mines, Imperial College London, London, UK
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7
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El‐Zoka AA, Stephenson LT, Kim S, Gault B, Raabe D. The Fate of Water in Hydrogen-Based Iron Oxide Reduction. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2023; 10:e2300626. [PMID: 37290039 PMCID: PMC10460863 DOI: 10.1002/advs.202300626] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 05/07/2023] [Indexed: 06/10/2023]
Abstract
Gas-solid reactions are important for many redox processes that underpin the energy and sustainability transition. The specific case of hydrogen-based iron oxide reduction is the foundation to render the global steel industry fossil-free, an essential target as iron production is the largest single industrial emitter of carbon dioxide. This perception of gas-solid reactions has not only been limited by the availability of state-of-the-art techniques which can delve into the structure and chemistry of reacted solids, but one continues to miss an important reaction partner that defines the thermodynamics and kinetics of gas phase reactions: the gas molecules. In this investigation, cryogenic-atom probe tomography is used to study the quasi in situ evolution of iron oxide in the solid and gas phases of the direct reduction of iron oxide by deuterium gas at 700°C. So far several unknown atomic-scale characteristics are observed, including, D2 accumulation at the reaction interface; formation of a core (wüstite)-shell (iron) structure; inbound diffusion of D through the iron layer and partitioning of D among phases and defects; outbound diffusion of oxygen through the wüstite and/or through the iron to the next free available inner/outer surface; and the internal formation of heavy nano-water droplets at nano-pores.
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Affiliation(s)
- Ayman A. El‐Zoka
- Max‐Planck‐Institut für EisenforschungMax‐Planck‐Strasse 140237DüsseldorfGermany
- Department of MaterialsRoyal School of MinesImperial CollegeLondonSW7 2AZUK
| | - Leigh T. Stephenson
- Max‐Planck‐Institut für EisenforschungMax‐Planck‐Strasse 140237DüsseldorfGermany
| | - Se‐Ho Kim
- Max‐Planck‐Institut für EisenforschungMax‐Planck‐Strasse 140237DüsseldorfGermany
- Department of Materials Science and EngineeringKorea UniversitySeoul02841Republic of Korea
| | - Baptiste Gault
- Max‐Planck‐Institut für EisenforschungMax‐Planck‐Strasse 140237DüsseldorfGermany
- Department of MaterialsRoyal School of MinesImperial CollegeLondonSW7 2AZUK
| | - Dierk Raabe
- Max‐Planck‐Institut für EisenforschungMax‐Planck‐Strasse 140237DüsseldorfGermany
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Douglas JO, Conroy M, Giuliani F, Gault B. In Situ Sputtering From the Micromanipulator to Enable Cryogenic Preparation of Specimens for Atom Probe Tomography by Focused-Ion Beam. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2023; 29:1009-1017. [PMID: 37749683 DOI: 10.1093/micmic/ozad020] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2022] [Revised: 01/13/2023] [Accepted: 02/05/2023] [Indexed: 09/27/2023]
Abstract
Workflows have been developed in the past decade to enable atom probe tomography analysis at cryogenic temperatures. The inability to control the local deposition of the metallic precursor from the gas-injection system (GIS) at cryogenic temperatures makes the preparation of site-specific specimens by using lift-out extremely challenging in the focused-ion beam. Schreiber et al. exploited redeposition to weld the lifted-out sample to a support. Here, we build on their approach to attach the region-of-interest and additionally strengthen the interface with locally sputtered metal from the micromanipulator. Following standard focused-ion beam annular milling, we demonstrate atom probe analysis of Si in both laser pulsing and voltage mode, with comparable analytical performance as a presharpened microtip coupon. Our welding approach is versatile, as various metals could be used for sputtering, and allows similar flexibility as the GIS in principle.
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Affiliation(s)
- James O Douglas
- Department of Materials, Royal School of Mines, Imperial College London, Prince Consort Road, London SW7 2BP, UK
| | - Michele Conroy
- Department of Materials, Royal School of Mines, Imperial College London, Prince Consort Road, London SW7 2BP, UK
| | - Finn Giuliani
- Department of Materials, Royal School of Mines, Imperial College London, Prince Consort Road, London SW7 2BP, UK
| | - Baptiste Gault
- Department of Materials, Royal School of Mines, Imperial College London, Prince Consort Road, London SW7 2BP, UK
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Str. 1, 40237 Düsseldorf, Germany
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9
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Gault B, Khanchandani H, Prithiv TS, Antonov S, Britton TB. Transmission Kikuchi Diffraction Mapping Induces Structural Damage in Atom Probe Specimens. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2023; 29:1026-1036. [PMID: 37749672 DOI: 10.1093/micmic/ozad029] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2022] [Revised: 01/23/2023] [Accepted: 02/21/2023] [Indexed: 09/27/2023]
Abstract
Measuring local chemistry of specific crystallographic features by atom probe tomography (APT) is facilitated by using transmission Kikuchi diffraction (TKD) to help position them sufficiently close to the apex of the needle-shaped specimen. However, possible structural damage associated to the energetic electrons used to perform TKD is rarely considered and is hence not well-understood. Here, in two case studies, we evidence damage in APT specimens from TKD mapping. First, we analyze a solid solution, metastable β-Ti-12Mo alloy, in which the Mo is expected to be homogenously distributed. Following TKD, APT reveals a planar segregation of Mo among other elements. Second, specimens were prepared near Σ3 twin boundaries in a high manganese twinning-induced plasticity steel, and subsequently charged with deuterium gas. Beyond a similar planar segregation, voids containing a high concentration of deuterium, i.e., bubbles, are detected in the specimen on which TKD was performed. Both examples showcase damage from TKD mapping leading to artefacts in the distribution of solutes. We propose that the structural damage is created by surface species, including H and C, subjected to recoil from incoming energetic electrons during mapping, thereby getting implanted and causing cascades of structural damage in the sample.
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Affiliation(s)
- Baptiste Gault
- Department of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf 40237, Germany
- Department of Materials, Royal School of Mines, Imperial College, Prince Consort Road, SW7 2BP London, UK
| | - Heena Khanchandani
- Department of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf 40237, Germany
| | - Thoudden Sukumar Prithiv
- Department of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf 40237, Germany
| | - Stoichko Antonov
- Department of Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf 40237, Germany
- National Energy Technology Laboratory, 1450 Queen Ave. SW, Albany, 97321 OR, USA
| | - T Ben Britton
- Department of Materials Engineering, University of British Columbia, Frank Forward Building, Stores Road 309-6350, Vancouver, BC, Canada V6T 1Z4
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10
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Dubosq R, Woods E, Gault B, Best JP. Electron microscope loading and in situ nanoindentation of water ice at cryogenic temperatures. PLoS One 2023; 18:e0281703. [PMID: 36763688 PMCID: PMC9917277 DOI: 10.1371/journal.pone.0281703] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2023] [Accepted: 01/30/2023] [Indexed: 02/12/2023] Open
Abstract
Interest in the technique of low temperature environmental nanoindentation has gained momentum in recent years. Low temperature indentation apparatuses can, for instance, be used for systematic measurements of the mechanical properties of ice in the laboratory, in order to accurately determine the inputs for the constitutive equations describing the rheologic behaviour of natural ice (i.e., the Glen flow law). These properties are essential to predict the movement of glaciers and ice sheets over time as a response to a changing climate. Herein, we introduce a new experimental setup and protocol for electron microscope loading and in situ nanoindentation of water ice. Preliminary testing on pure water ice yield elastic modulus and hardness measurements of 4.1 GPa and 176 MPa, respectively, which fall within the range of previously published values. Our approach demonstrates the potential of low temperature, in situ, instrumented nanoindentation of ice under controlled conditions in the SEM, opening the possibility for investigating individual structural elements and systematic studies across species and concentration of impurities to refine to constitutive equations for natural ice.
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Affiliation(s)
- Renelle Dubosq
- Max-Planck-Institüt für Eisenforschung GmbH, Düsseldorf, Germany
| | - Eric Woods
- Max-Planck-Institüt für Eisenforschung GmbH, Düsseldorf, Germany
| | - Baptiste Gault
- Max-Planck-Institüt für Eisenforschung GmbH, Düsseldorf, Germany
- Department of Materials, Royal School of Mines, Imperial College London, London, United Kingdom
| | - James P. Best
- Max-Planck-Institüt für Eisenforschung GmbH, Düsseldorf, Germany
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11
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Gemma R, Al-Kassab T, Pundt A. Deuterium Distribution in Fe/V Multi-Layered Films. Molecules 2022; 27:molecules27227848. [PMID: 36431946 PMCID: PMC9697912 DOI: 10.3390/molecules27227848] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2022] [Revised: 10/21/2022] [Accepted: 10/25/2022] [Indexed: 11/16/2022] Open
Abstract
The recent progress of Atom Probe Tomography (APT) has opened up atomic-scale elemental analysis including hydrogen species. For APT measurements, the use of deuterium is highly recommended, due to its low mobility compared to the fast and quantum mechanically tunneling isotope hydrogen. In addition, deuterium can be distinguished from hydrogen originating from the APT analysis chamber. To date, however, APT studies on materials with high D concentrations are scarce. In this study, the D concentration profile in a Fe/V multi-layered film sample was investigated, and spanned a wide concentration range. The mean hydrogen isotope concentration was alternatively quantified by electromotive force (EMF) measurements on a similar Fe/V film, thus verifying the APT results. The reduction found in the D concentration at the Fe/V interface results from local alloying at the Fe/V interfaces which accompanies a change in the available volume in the V lattice. Even at the same Fe concentration, the shape of the observed D depth profile was asymmetric at high D2 pressures. This indicates a stress impact caused by the deposition sequence.
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Affiliation(s)
- Ryota Gemma
- Department of Applied Chemistry, Tokai University, Hiratsuka 259-1292, Japan
- Micro/Nano Technology Center, Tokai University, Hiratsuka 259-1292, Japan
- Institute of Materials Physics, University of Göttingen, 37077 Göttingen, Germany
- Correspondence:
| | - Talaat Al-Kassab
- Institute of Materials Physics, University of Göttingen, 37077 Göttingen, Germany
| | - Astrid Pundt
- Institute of Materials Physics, University of Göttingen, 37077 Göttingen, Germany
- Institute for Applied Materials–Materials Science and Engineering (IAM-WK), Karlsruhe Institute of Technology, 76131 Karlsruhe, Germany
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12
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Schwarz TM, Ott J, Solodenko H, Schmitz G, Stender P. Nanoscale analysis of frozen honey by atom probe tomography. Sci Rep 2022; 12:17786. [PMID: 36273026 PMCID: PMC9587987 DOI: 10.1038/s41598-022-22717-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2022] [Accepted: 10/18/2022] [Indexed: 01/19/2023] Open
Abstract
Three-dimensional reconstruction of the analysed volume is one of the main goals of atom probe tomography (APT) and can deliver nearly atomic resolution (~ 0.2 nm spatial resolution) and chemical information with a mass sensitivity down to the ppm range. Extending this technique to frozen biological systems would have an enormous impact on the structural analysis of biomolecules. In previous works, we have shown that it is possible to measure frozen liquids with APT. In this paper, we demonstrate the ability of APT to trace nanoscale precipitation in frozen natural honey. While the mass signals of the common sugar fragments CxHy and CxOyHz overlap with (H2O)nH from water, we achieved correct stoichiometric values via different interpretation approaches for the peaks and thus determined the water content reliably. Next, we use honey to investigate the spatial resolution capabilities as a step toward the measurement of biological molecules in solution in 3D with sub-nanometer resolution. This may take analytical techniques to a new level, since methods of chemical characterization for cryogenic samples, especially biological samples, are still limited.
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Affiliation(s)
- Tim M. Schwarz
- grid.5719.a0000 0004 1936 9713Institute for Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstr. 3, 70569 Stuttgart, Germany
| | - Jonas Ott
- grid.5719.a0000 0004 1936 9713Institute for Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstr. 3, 70569 Stuttgart, Germany
| | - Helena Solodenko
- grid.5719.a0000 0004 1936 9713Institute for Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstr. 3, 70569 Stuttgart, Germany
| | - Guido Schmitz
- grid.5719.a0000 0004 1936 9713Institute for Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstr. 3, 70569 Stuttgart, Germany
| | - Patrick Stender
- grid.5719.a0000 0004 1936 9713Institute for Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstr. 3, 70569 Stuttgart, Germany
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13
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Kim SH, Dong K, Zhao H, El-Zoka AA, Zhou X, Woods EV, Giuliani F, Manke I, Raabe D, Gault B. Understanding the Degradation of a Model Si Anode in a Li-Ion Battery at the Atomic Scale. J Phys Chem Lett 2022; 13:8416-8421. [PMID: 36049043 PMCID: PMC9486947 DOI: 10.1021/acs.jpclett.2c02236] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
To advance the understanding of the degradation of the liquid electrolyte and Si electrode, and their interface, we exploit the latest developments in cryo-atom probe tomography. We evidence Si anode corrosion from the decomposition of the Li salt before charge-discharge cycles even begin. Volume shrinkage during delithiation leads to the development of nanograins from recrystallization in regions left amorphous by the lithiation. The newly created grain boundaries facilitate pulverization of nanoscale Si fragments, and one is found floating in the electrolyte. P is segregated to these grain boundaries, which confirms the decomposition of the electrolyte. As structural defects are bound to assist the nucleation of Li-rich phases in subsequent lithiations and accelerate the electrolyte's decomposition, these insights into the developed nanoscale microstructure interacting with the electrolyte contribute to understanding the self-catalyzed/accelerated degradation Si anodes and can inform new battery designs unaffected by these life-limiting factors.
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Affiliation(s)
- Se-Ho Kim
- Max-Planck
Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
| | - Kang Dong
- Institute
of Applied Materials, Helmholtz-Zentrum
Berlin für Materialien und Energie, Berlin 14109, Germany
| | - Huan Zhao
- Max-Planck
Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
| | - Ayman A. El-Zoka
- Max-Planck
Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
| | - Xuyang Zhou
- Max-Planck
Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
| | - Eric V. Woods
- Max-Planck
Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
| | - Finn Giuliani
- Department
of Materials, Royal School of Mines, Imperial
College, London SW7 2AZ, United Kingdom
| | - Ingo Manke
- Institute
of Applied Materials, Helmholtz-Zentrum
Berlin für Materialien und Energie, Berlin 14109, Germany
| | - Dierk Raabe
- Max-Planck
Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
| | - Baptiste Gault
- Max-Planck
Institut für Eisenforschung GmbH, Max-Planck-Straße 1, Düsseldorf 40237, Germany
- Department
of Materials, Royal School of Mines, Imperial
College, London SW7 2AZ, United Kingdom
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14
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Zhang S, Gervinskas G, Qiu S, Venugopal H, Marceau RKW, de Marco A, Li J, Fu J. Methods of Preparing Nanoscale Vitreous Ice Needles for High-Resolution Cryogenic Characterization. NANO LETTERS 2022; 22:6501-6508. [PMID: 35926226 DOI: 10.1021/acs.nanolett.2c01495] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
New high-resolution imaging methods for biological samples such as atom probe tomography (APT), facilitated by the invention of laser-pulsed atom probes and cryo-transfer procedures, have recently emerged. However, ensuring the vitreous state of the fabricated aqueous needle-shaped APT samples remains a challenge despite it being crucial for characterizing biomolecules such as proteins and cellular architectures in their near-native state. Our work investigated three potential approaches: (1) open microcapillary (OMC) method, (2) high-pressure freezing method (HPF), and (3) graphene encapsulation method. Diffraction patterns of the needle specimens acquired by cryo-TEM have demonstrated the vitreous state of the ice needles, although limited to the tip regions, has been achieved with the three proposed approaches. With the capability to prepare vitreous ice needles from hydrated samples of up to ∼200 μm thickness (HPF), combined use of the three approaches opens new avenues for future near-atomic imaging of biological cells in their near-native state.
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Affiliation(s)
- Shuo Zhang
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Gediminas Gervinskas
- Ramaciotti Centre for Electron Microscopy, Monash University, Clayton, Victoria 3800, Australia
| | - Shi Qiu
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
| | - Hari Venugopal
- Ramaciotti Centre for Electron Microscopy, Monash University, Clayton, Victoria 3800, Australia
| | - Ross K W Marceau
- Institute for Frontier Materials, Deakin University, Geelong, Victoria 3216, Australia
| | - Alex de Marco
- Department of Biochemistry and Molecular Biology, Monash University, Clayton, Victoria 3800, Australia
- Monash Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, VIC 3800, Australia
| | - Jian Li
- Monash Biomedicine Discovery Institute, Department of Microbiology, Monash University, Clayton, VIC 3800, Australia
- Department of Microbiology, Monash University, Clayton, Victoria 3800, Australia
| | - Jing Fu
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC 3800, Australia
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15
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Segreto N, Schwarz TM, Dietrich CA, Stender P, Schuldt R, Schmitz G, Kästner J. Understanding the Underlying Field Evaporation Mechanism of Pure Water Tips in High Electrical Fields. J Phys Chem A 2022; 126:5663-5671. [PMID: 35972399 DOI: 10.1021/acs.jpca.2c04163] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We investigated the field evaporation process of frozen water in atom probe tomography (APT) by density functional simulations. In previous experiments, a strong tailing effect was observed for peaks caused by the molecular structure (H2O)nH+, in contrast to other peaks. In purely field-induced and thermally assisted evaporation simulations, we found that chains of protonated water molecules were pulled out of the dielectric surface by up to 6 Å, which are stable over a wide range of field strengths. Therefore, the resulting water clusters experience only part of the acceleration after evaporation compared to molecules evaporating directly from the surface and, thus, exhibit an energy deficit, which explains the tailing effect. Our simulations provide new insight into the complex evaporation behavior of water in high electrical fields and reveal possibilities for adapting the existing reconstruction algorithms.
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Affiliation(s)
- Nico Segreto
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Tim M Schwarz
- Institute for Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstraße 3, 70569 Stuttgart, Germany
| | - Carolin A Dietrich
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Patrick Stender
- Institute for Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstraße 3, 70569 Stuttgart, Germany
| | - Robin Schuldt
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
| | - Guido Schmitz
- Institute for Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstraße 3, 70569 Stuttgart, Germany
| | - Johannes Kästner
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569 Stuttgart, Germany
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16
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Grandfield K, Micheletti C, Deering J, Arcuri G, Tang T, Langelier B. Atom Probe Tomography for Biomaterials and Biomineralization. Acta Biomater 2022; 148:44-60. [DOI: 10.1016/j.actbio.2022.06.010] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2022] [Revised: 05/18/2022] [Accepted: 06/06/2022] [Indexed: 01/27/2023]
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17
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Kim SH, Antonov S, Zhou X, Stephenson LT, Jung C, El-Zoka AA, Schreiber DK, Conroy M, Gault B. Atom probe analysis of electrode materials for Li-ion batteries: challenges and ways forward. JOURNAL OF MATERIALS CHEMISTRY. A 2022; 10:4926-4935. [PMID: 35341092 PMCID: PMC8887568 DOI: 10.1039/d1ta10050e] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2021] [Accepted: 01/26/2022] [Indexed: 05/24/2023]
Abstract
The worldwide development of electric vehicles as well as large-scale or grid-scale energy storage to compensate for the intermittent nature of renewable energy generation has led to a surge of interest in battery technology. Understanding the factors controlling battery capacity and, critically, their degradation mechanisms to ensure long-term, sustainable and safe operation requires detailed knowledge of their microstructure and chemistry, and their evolution under operating conditions, on the nanoscale. Atom probe tomography (APT) provides compositional mapping of materials in three dimensions with sub-nanometre resolution, and is poised to play a key role in battery research. However, APT is underpinned by an intense electric field that can drive lithium migration, and many battery materials are reactive oxides, requiring careful handling and sample transfer. Here, we report on the analysis of both anode and cathode materials and show that electric-field driven migration can be suppressed by using shielding by embedding powder particles in a metallic matrix or by using a thin conducting surface layer. We demonstrate that for a typical cathode material, cryogenic specimen preparation and transport under ultra-high vacuum leads to major delithiation of the specimen during the analysis. In contrast, the transport of specimens through air enables the analysis of the material. Finally, we discuss the possible physical underpinnings and discuss ways forward to enable shielding from the electric field, which helps address the challenges inherent to the APT analysis of battery materials.
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Affiliation(s)
- Se-Ho Kim
- Max-Planck-Institut für Eisenforschung Düsseldorf Germany
| | | | - Xuyang Zhou
- Max-Planck-Institut für Eisenforschung Düsseldorf Germany
| | | | - Chanwon Jung
- Max-Planck-Institut für Eisenforschung Düsseldorf Germany
| | | | - Daniel K Schreiber
- Energy and Environment Directorate, Pacific Northwest National Laboratory P.O. Box 999 Richland WA 99352 USA
| | - Michele Conroy
- Department of Materials, Royal School of Mines, Imperial College London London UK
| | - Baptiste Gault
- Max-Planck-Institut für Eisenforschung Düsseldorf Germany
- Department of Materials, Royal School of Mines, Imperial College London London UK
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18
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Khanchandani H, Kim SH, Varanasi RS, Prithiv TS, Stephenson LT, Gault B. Hydrogen and deuterium charging of lifted-out specimens for atom probe tomography. OPEN RESEARCH EUROPE 2022; 1:122. [PMID: 37645172 PMCID: PMC10445872 DOI: 10.12688/openreseurope.14176.2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/17/2022] [Indexed: 08/31/2023]
Abstract
Hydrogen embrittlement can cause a dramatic deterioration of the mechanical properties of high-strength metallic materials. Despite decades of experimental and modelling studies, the exact underlying mechanisms behind hydrogen embrittlement remain elusive. To unlock understanding of the mechanism and thereby help mitigate the influence of hydrogen and the associated embrittlement, it is essential to examine the interactions of hydrogen with structural defects such as grain boundaries, dislocations and stacking faults. Atom probe tomography (APT) can, in principle, analyse hydrogen located specifically at such microstructural features but faces strong challenges when it comes to charging specimens with hydrogen or deuterium. Here, we describe three different workflows enabling hydrogen/deuterium charging of site-specific APT specimens: namely cathodic, plasma and gas charging. All the experiments in the current study have been performed on a model twinning induced plasticity steel alloy. We discuss in detail the caveats of the different approaches in order to help future research efforts and facilitate further studies of hydrogen in metals. Our study demonstrates successful cathodic and gas charging, with the latter being more promising for the analysis of the high-strength steels at the core of our work.
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Affiliation(s)
- Heena Khanchandani
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf, 40237, Germany
| | - Se-Ho Kim
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf, 40237, Germany
| | | | - TS Prithiv
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf, 40237, Germany
| | - Leigh T. Stephenson
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf, 40237, Germany
| | - Baptiste Gault
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf, 40237, Germany
- Department of Materials, Royal School of Mines, Imperial College, Prince Consort Road, London, SW7 2BP, UK
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19
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Khanchandani H, Kim SH, Varanasi RS, Prithiv TS, Stephenson LT, Gault B. Hydrogen and deuterium charging of lifted-out specimens for atom probe tomography. OPEN RESEARCH EUROPE 2022; 1:122. [PMID: 37645172 PMCID: PMC10445872 DOI: 10.12688/openreseurope.14176.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 02/17/2022] [Indexed: 08/31/2023]
Abstract
Hydrogen embrittlement can cause a dramatic deterioration of the mechanical properties of high-strength metallic materials. Despite decades of experimental and modelling studies, the exact underlying mechanisms behind hydrogen embrittlement remain elusive. To unlock understanding of the mechanism and thereby help mitigate the influence of hydrogen and the associated embrittlement, it is essential to examine the interactions of hydrogen with structural defects such as grain boundaries, dislocations and stacking faults. Atom probe tomography (APT) can, in principle, analyse hydrogen located specifically at such microstructural features but faces strong challenges when it comes to charging specimens with hydrogen or deuterium. Here, we describe three different workflows enabling hydrogen/deuterium charging of site-specific APT specimens: namely cathodic, plasma and gas charging. All the experiments in the current study have been performed on a model twinning induced plasticity steel alloy. We discuss in detail the caveats of the different approaches in order to help future research efforts and facilitate further studies of hydrogen in metals. Our study demonstrates successful cathodic and gas charging, with the latter being more promising for the analysis of the high-strength steels at the core of our work.
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Affiliation(s)
- Heena Khanchandani
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf, 40237, Germany
| | - Se-Ho Kim
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf, 40237, Germany
| | | | - TS Prithiv
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf, 40237, Germany
| | - Leigh T. Stephenson
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf, 40237, Germany
| | - Baptiste Gault
- Max-Planck-Institut für Eisenforschung, Max-Planck-Str. 1, Düsseldorf, 40237, Germany
- Department of Materials, Royal School of Mines, Imperial College, Prince Consort Road, London, SW7 2BP, UK
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20
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Hydrogen trapping and embrittlement in high-strength Al alloys. Nature 2022; 602:437-441. [PMID: 35173345 PMCID: PMC8850197 DOI: 10.1038/s41586-021-04343-z] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2021] [Accepted: 12/13/2021] [Indexed: 11/23/2022]
Abstract
Ever more stringent regulations on greenhouse gas emissions from transportation motivate efforts to revisit materials used for vehicles1. High-strength aluminium alloys often used in aircrafts could help reduce the weight of automobiles, but are susceptible to environmental degradation2,3. Hydrogen ‘embrittlement’ is often indicated as the main culprit4; however, the exact mechanisms underpinning failure are not precisely known: atomic-scale analysis of H inside an alloy remains a challenge, and this prevents deploying alloy design strategies to enhance the durability of the materials. Here we performed near-atomic-scale analysis of H trapped in second-phase particles and at grain boundaries in a high-strength 7xxx Al alloy. We used these observations to guide atomistic ab initio calculations, which show that the co-segregation of alloying elements and H favours grain boundary decohesion, and the strong partitioning of H into the second-phase particles removes solute H from the matrix, hence preventing H embrittlement. Our insights further advance the mechanistic understanding of H-assisted embrittlement in Al alloys, emphasizing the role of H traps in minimizing cracking and guiding new alloy design. Atom-scale analysis of hydrogen and other elements at the grain boundaries of a 7xxx aluminium alloy shows that co-segregation of elements favours grain boundary decohesion, and that hydrogen embrittlement is prevented by strong partitioning into the second-phase particles.
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21
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Khanchandani H, El-Zoka AA, Kim SH, Tezins U, Vogel D, Sturm A, Raabe D, Gault B, Stephenson LT. Laser-equipped gas reaction chamber for probing environmentally sensitive materials at near atomic scale. PLoS One 2022; 17:e0262543. [PMID: 35139091 PMCID: PMC8827481 DOI: 10.1371/journal.pone.0262543] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2021] [Accepted: 12/28/2021] [Indexed: 11/19/2022] Open
Abstract
Numerous metallurgical and materials science applications depend on quantitative atomic-scale characterizations of environmentally-sensitive materials and their transient states. Studying the effect upon materials subjected to thermochemical treatments in specific gaseous atmospheres is of central importance for specifically studying a material's resistance to certain oxidative or hydrogen environments. It is also important for investigating catalytic materials, direct reduction of an oxide, particular surface science reactions or nanoparticle fabrication routes. This manuscript realizes such experimental protocols upon a thermochemical reaction chamber called the "Reacthub" and allows for transferring treated materials under cryogenic & ultrahigh vacuum (UHV) workflow conditions for characterisation by either atom probe or scanning Xe+/electron microscopies. Two examples are discussed in the present study. One protocol was in the deuterium gas charging (25 kPa D2 at 200°C) of a high-manganese twinning-induced-plasticity (TWIP) steel and characterization of the ingress and trapping of hydrogen at various features (grain boundaries in particular) in efforts to relate this to the steel's hydrogen embrittlement susceptibility. Deuterium was successfully detected after gas charging but most contrast originated from the complex ion FeOD+ signal and the feature may be an artefact. The second example considered the direct deuterium reduction (5 kPa D2 at 700°C) of a single crystal wüstite (FeO) sample, demonstrating that under a standard thermochemical treatment causes rapid reduction upon the nanoscale. In each case, further studies are required for complete confidence about these phenomena, but these experiments successfully demonstrate that how an ex-situ thermochemical treatment can be realised that captures environmentally-sensitive transient states that can be analysed by atomic-scale by atom probe microscope.
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Affiliation(s)
- Heena Khanchandani
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straβe 1, Düsseldorf, Germany
| | - Ayman A. El-Zoka
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straβe 1, Düsseldorf, Germany
| | - Se-Ho Kim
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straβe 1, Düsseldorf, Germany
| | - Uwe Tezins
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straβe 1, Düsseldorf, Germany
| | - Dirk Vogel
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straβe 1, Düsseldorf, Germany
| | - Andreas Sturm
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straβe 1, Düsseldorf, Germany
| | - Dierk Raabe
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straβe 1, Düsseldorf, Germany
| | - Baptiste Gault
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straβe 1, Düsseldorf, Germany
- Department of Materials, Imperial College, South Kensington, London, United Kingdom
| | - Leigh T. Stephenson
- Max-Planck-Institut für Eisenforschung GmbH, Max-Planck-Straβe 1, Düsseldorf, Germany
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22
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Stender P, Gault B, Schwarz TM, Woods EV, Kim SH, Ott J, Stephenson LT, Schmitz G, Freysoldt C, Kästner J, El-Zoka AA. Status and Direction of Atom Probe Analysis of Frozen Liquids. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2022; 28:1-18. [PMID: 35039105 DOI: 10.1017/s1431927621013994] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Imaging of liquids and cryogenic biological materials by electron microscopy has been recently enabled by innovative approaches for specimen preparation and the fast development of optimized instruments for cryo-enabled electron microscopy (cryo-EM). Yet, cryo-EM typically lacks advanced analytical capabilities, in particular for light elements. With the development of protocols for frozen wet specimen preparation, atom probe tomography (APT) could advantageously complement insights gained by cryo-EM. Here, we report on different approaches that have been recently proposed to enable the analysis of relatively large volumes of frozen liquids from either a flat substrate or the fractured surface of a wire. Both allowed for analyzing water ice layers which are several micrometers thick consisting of pure water, pure heavy water, and aqueous solutions. We discuss the merits of both approaches and prospects for further developments in this area. Preliminary results raise numerous questions, in part concerning the physics underpinning field evaporation. We discuss these aspects and lay out some of the challenges regarding the APT analysis of frozen liquids.
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Affiliation(s)
- Patrick Stender
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
| | - Baptiste Gault
- Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
- Department of Materials, Royal School of Mines, Imperial College London, London, UK
| | - Tim M Schwarz
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
| | - Eric V Woods
- Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
| | - Se-Ho Kim
- Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
| | - Jonas Ott
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
| | | | - Guido Schmitz
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
| | | | - Johannes Kästner
- Institute for Theoretical Chemistry, University of Stuttgart, Pfaffenwaldring 55, 70569Stuttgart, Germany
| | - Ayman A El-Zoka
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
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Stender P, Solodenko H, Weigel A, Balla I, Schwarz TM, Ott J, Roussell M, Joshi Y, Duran R, Al-Shakran M, Jacob T, Schmitz G. A Modular Atom Probe Concept: Design, Operational Aspects, and Performance of an Integrated APT-FIB/SEM Solution. MICROSCOPY AND MICROANALYSIS : THE OFFICIAL JOURNAL OF MICROSCOPY SOCIETY OF AMERICA, MICROBEAM ANALYSIS SOCIETY, MICROSCOPICAL SOCIETY OF CANADA 2022; 28:1-13. [PMID: 35039107 DOI: 10.1017/s1431927621013982] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Atomic probe tomography (APT) is able to generate three-dimensional chemical maps in atomic resolution. The required instruments for APT have evolved over the last 20 years from an experimental to an established method of materials analysis. Here, we describe the realization of a new modular instrument concept that allows the direct attachment of APT to a dual-beam SEM microscope with the main achievement of fast and direct sample transfer and high flexibility in chamber and component configuration. New operational modes are enabled regarding sample geometry, alignment of tips, and the microelectrode. The instrument is optimized to handle cryo-samples at all stages of preparation and storage. It comes with its own software for evaluation and reconstruction. The performance in terms of mass resolution, aperture angle, and detection efficiency is demonstrated with a few application examples.
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Affiliation(s)
- Patrick Stender
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
- Inspico, TTI GmbH, Nobelstraße 15, 70569Stuttgart, Germany
| | - Helena Solodenko
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
| | - Andreas Weigel
- Inspico, TTI GmbH, Nobelstraße 15, 70569Stuttgart, Germany
| | - Irdi Balla
- Inspico, TTI GmbH, Nobelstraße 15, 70569Stuttgart, Germany
| | - Tim Maximilian Schwarz
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
| | - Jonas Ott
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
| | - Manuel Roussell
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
| | - Yug Joshi
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
| | - Rüya Duran
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
| | - Mohammad Al-Shakran
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081Ulm, Germany
| | - Timo Jacob
- Institute of Electrochemistry, Ulm University, Albert-Einstein-Allee 47, 89081Ulm, Germany
| | - Guido Schmitz
- Institute of Materials Science, Chair of Materials Physics, University of Stuttgart, Heisenbergstrasse 3, 70569Stuttgart, Germany
- Inspico, TTI GmbH, Nobelstraße 15, 70569Stuttgart, Germany
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Macauley C, Heller M, Rausch A, Kümmel F, Felfer P. A versatile cryo-transfer system, connecting cryogenic focused ion beam sample preparation to atom probe microscopy. PLoS One 2021; 16:e0245555. [PMID: 33465106 PMCID: PMC7815152 DOI: 10.1371/journal.pone.0245555] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2020] [Accepted: 01/04/2021] [Indexed: 11/24/2022] Open
Abstract
Atom probe tomography (APT) is a powerful technique to obtain 3D chemical and structural information, however the 'standard' atom probe experimental workflow involves transfer of specimens at ambient conditions. The ability to transfer air- or thermally-sensitive samples between instruments while maintaining environmental control is critical to prevent chemical or morphological changes prior to analysis for a variety of interesting sample materials. In this article, we describe a versatile transfer system that enables cryogenic- or room-temperature transfer of specimens in vacuum or atmospheric conditions between sample preparation stations, a focused ion beam system (Zeiss Crossbeam 540) and a widely used commercial atom probe system (CAMECA LEAP 4000X HR). As an example for the use of this transfer system, we present atom probe data of gallium- (Ga)-free grain boundaries in an aluminum (Al) alloy specimen prepared with a Ga-based FIB.
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Affiliation(s)
- Chandra Macauley
- Institute I, Materials Science & Engineering Department, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
- Interdisciplinary Center for Nanostructured Films (IZNF), Erlangen, Germany
| | - Martina Heller
- Institute I, Materials Science & Engineering Department, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
- Interdisciplinary Center for Nanostructured Films (IZNF), Erlangen, Germany
| | - Alexander Rausch
- Institute I, Materials Science & Engineering Department, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Frank Kümmel
- Institute I, Materials Science & Engineering Department, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
| | - Peter Felfer
- Institute I, Materials Science & Engineering Department, Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Erlangen, Germany
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25
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Gault B, Chiaramonti A, Cojocaru-Mirédin O, Stender P, Dubosq R, Freysoldt C, Makineni SK, Li T, Moody M, Cairney JM. Atom probe tomography. NATURE REVIEWS. METHODS PRIMERS 2021; 1:10.1038/s43586-021-00047-w. [PMID: 37719173 PMCID: PMC10502706 DOI: 10.1038/s43586-021-00047-w] [Citation(s) in RCA: 52] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 06/01/2021] [Indexed: 09/19/2023]
Abstract
Atom probe tomography (APT) provides three-dimensional compositional mapping with sub-nanometre resolution. The sensitivity of APT is in the range of parts per million for all elements, including light elements such as hydrogen, carbon or lithium, enabling unique insights into the composition of performance-enhancing or lifetime-limiting microstructural features and making APT ideally suited to complement electron-based or X-ray-based microscopies and spectroscopies. Here, we provide an introductory overview of APT ranging from its inception as an evolution of field ion microscopy to the most recent developments in specimen preparation, including for nanomaterials. We touch on data reconstruction, analysis and various applications, including in the geosciences and the burgeoning biological sciences. We review the underpinnings of APT performance and discuss both strengths and limitations of APT, including how the community can improve on current shortcomings. Finally, we look forwards to true atomic-scale tomography with the ability to measure the isotopic identity and spatial coordinates of every atom in an ever wider range of materials through new specimen preparation routes, novel laser pulsing and detector technologies, and full interoperability with complementary microscopy techniques.
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Affiliation(s)
- Baptiste Gault
- Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
- Department of Materials, Royal School of Mines, Imperial College, London, UK
| | - Ann Chiaramonti
- National Institute of Standards and Technology, Applied Chemicals and Materials Division, Boulder, CO, USA
| | | | - Patrick Stender
- Institute of Materials Science, University of Stuttgart, Stuttgart, Germany
| | - Renelle Dubosq
- Department of Earth and Environmental Sciences, University of Ottawa, Ottawa, Ontario, Canada
| | | | | | - Tong Li
- Institute for Materials, Ruhr-Universität Bochum, Bochum, Germany
| | - Michael Moody
- Department of Materials, University of Oxford, Oxford, UK
| | - Julie M. Cairney
- Australian Centre for Microscopy and Microanalysis, University of Sydney, Sydney, New South Wales, Australia
- School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, Sydney, New South Wales, Australia
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26
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El-Zoka AA, Kim SH, Deville S, Newman RC, Stephenson LT, Gault B. Enabling near-atomic-scale analysis of frozen water. SCIENCE ADVANCES 2020; 6:6/49/eabd6324. [PMID: 33277259 PMCID: PMC7821902 DOI: 10.1126/sciadv.abd6324] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Accepted: 10/21/2020] [Indexed: 05/04/2023]
Abstract
Transmission electron microscopy went through a revolution enabling routine cryo-imaging of biological and (bio)chemical systems, in liquid form. Yet, these approaches typically lack advanced analytical capabilities. Here, we used atom probe tomography to analyze frozen liquids in three dimensions with subnanometer resolution. We introduce a specimen preparation strategy using nanoporous gold. We report data on 2- to 3-μm-thick layers of ice formed from both high-purity deuterated water and a solution of 50 mM NaCl in high-purity deuterated water. The analysis of the gold-ice interface reveals a substantial increase in the solute concentrations across the interface. We explore a range of experimental parameters to show that atom probe analyses of bulk aqueous specimens come with their own challenges and discuss physical processes that produce the observed phenomena. Our study demonstrates the viability of using frozen water as a carrier for near-atomic-scale analysis of objects in solution by atom probe tomography.
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Affiliation(s)
- A A El-Zoka
- Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany.
| | - S-H Kim
- Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
| | - S Deville
- Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, 69622 Villeurbanne, France
| | - R C Newman
- Department of Chemical Engineering & Applied Chemistry, University of Toronto, Toronto, Canada
| | - L T Stephenson
- Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany
| | - B Gault
- Max-Planck-Institut für Eisenforschung, Düsseldorf, Germany.
- Department of Materials, Royal School of Mines, Imperial College London, London, UK
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27
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Aggregated nanoparticles: Sample preparation and analysis by atom probe tomography. Ultramicroscopy 2020; 218:113082. [DOI: 10.1016/j.ultramic.2020.113082] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2020] [Revised: 07/11/2020] [Accepted: 07/20/2020] [Indexed: 11/21/2022]
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28
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McCarroll I, Bagot P, Devaraj A, Perea D, Cairney J. New frontiers in atom probe tomography: a review of research enabled by cryo and/or vacuum transfer systems. MATERIALS TODAY. ADVANCES 2020; 7:100090. [PMID: 33103106 PMCID: PMC7581275 DOI: 10.1016/j.mtadv.2020.100090] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
There has been a recent surge in the use of cryo and/or vacuum specimen preparation and transfer systems to broaden the scope of research enabled by the microscopy technique of atom probe tomography. This is driven by the fact that, as for many microscopes, the application of atom probes to air- and temperature-sensitive materials or wet biological specimens has previously been limited by transfer through air at room temperature. Here we provide an overview of areas of research that benefit from these new transfer and analysis protocols, as well as a review of current advances in transfer devices, environmental cells, and glove boxes for controlled specimen manipulation. This includes the study of catalysis and corrosion, biological samples, liquid-solid interfaces, natural aging, and the distribution of hydrogen in materials.
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Affiliation(s)
- I.E. McCarroll
- Australian Centre for Microscopy and Microanalysis, University of Sydney, Madsen Building F09, NSW 2006, Australia
| | - P.A.J. Bagot
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, United Kingdom
| | - A. Devaraj
- Physical and Computational Sciences Directorate, Pacific Northwest National Laboratory, P.O. Box 999, Richland, WA 99352, USA
| | - D.E. Perea
- Environmental Molecular Science Laboratory, Pacific Northwest National Laboratory, P.O. Box 999 Richland, WA 99352, USA
| | - J.M. Cairney
- Australian Centre for Microscopy and Microanalysis, University of Sydney, Madsen Building F09, NSW 2006, Australia
- School of Aerospace, Mechanical and Mechatronic Engineering, University of Sydney, NSW 2006, Australia
- Corresponding author. (J.M. Cairney)
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29
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Qiu S, Garg V, Zhang S, Chen Y, Li J, Taylor A, Marceau RKW, Fu J. Graphene encapsulation enabled high-throughput atom probe tomography of liquid specimens. Ultramicroscopy 2020; 216:113036. [PMID: 32540722 DOI: 10.1016/j.ultramic.2020.113036] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2019] [Revised: 05/11/2020] [Accepted: 05/27/2020] [Indexed: 12/22/2022]
Abstract
A new method for imaging liquid specimens with atom probe tomography (APT) is proposed by introducing graphene encapsulation. By tuning the encapsulation speed and the number of encapsulations, controllable volumes of liquid can be encapsulated on a pre-sharpened specimen tip, with the end radius less than 75 nm to allow field ionization and evaporation. Encapsulation of liquid has been confirmed by using various characterization techniques, including electron microscopy and stimulated emission depletion microscopy. The graphene-encapsulated liquid specimen was then directly frozen at the cryogenic stage inside the atom probe instrument, followed by APT imaging in laser-pulsed mode. Using water as a test example, water-related ions have been identified in the acquired mass spectrum, which are spatially correlated to a reconstructed three-dimensional volume of water on top of the base specimen tip, as clearly revealed in the chemical maps. In addition, the proposed method has also been shown to produce multiple liquid specimens simultaneously on a pre-sharpened silicon micro-tip array for high-throughput APT imaging of liquid specimens. It is expected that the proposed lift-out-free method for preparing APT specimens in their hydrated state will open a new avenue for obtaining insights into various materials at atomic resolution.
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Affiliation(s)
- Shi Qiu
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC3800, Australia
| | - Vivek Garg
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC3800, Australia; IITB-Monash Research Academy, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Shuo Zhang
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC3800, Australia
| | - Yu Chen
- Monash Centre for Electron Microscopy, Monash University, Clayton, VIC3800, Australia
| | - Jian Li
- Biomedicine Discovery Institute, Monash University, Clayton, VIC3800, Australia; Department of Microbiology, Monash University, Clayton, VIC3800, Australia
| | - Adam Taylor
- Deakin University, Institute for Frontier Materials, Geelong, VIC3216, Australia
| | - Ross K W Marceau
- Deakin University, Institute for Frontier Materials, Geelong, VIC3216, Australia.
| | - Jing Fu
- Department of Mechanical and Aerospace Engineering, Monash University, Clayton, VIC3800, Australia; ARC Centre of Excellence for Advanced Molecular Imaging, Monash University, Clayton, VIC3800, Australia.
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30
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Chen YS, Lu H, Liang J, Rosenthal A, Liu H, Sneddon G, McCarroll I, Zhao Z, Li W, Guo A, Cairney JM. Observation of hydrogen trapping at dislocations, grain boundaries, and precipitates. Science 2020; 367:171-175. [PMID: 31919217 DOI: 10.1126/science.aaz0122] [Citation(s) in RCA: 150] [Impact Index Per Article: 37.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Accepted: 11/14/2019] [Indexed: 11/02/2022]
Abstract
Hydrogen embrittlement of high-strength steel is an obstacle for using these steels in sustainable energy production. Hydrogen embrittlement involves hydrogen-defect interactions at multiple-length scales. However, the challenge of measuring the precise location of hydrogen atoms limits our understanding. Thermal desorption spectroscopy can identify hydrogen retention or trapping, but data cannot be easily linked to the relative contributions of different microstructural features. We used cryo-transfer atom probe tomography to observe hydrogen at specific microstructural features in steels. Direct observation of hydrogen at carbon-rich dislocations and grain boundaries provides validation for embrittlement models. Hydrogen observed at an incoherent interface between niobium carbides and the surrounding steel provides direct evidence that these incoherent boundaries can act as trapping sites. This information is vital for designing embrittlement-resistant steels.
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Affiliation(s)
- Yi-Sheng Chen
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, Australia.,School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, Australia
| | | | - Jiangtao Liang
- Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, China
| | | | - Hongwei Liu
- Sydney Microscopy and Microanalysis, The University of Sydney, Sydney, Australia
| | - Glenn Sneddon
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, Australia.,School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, Australia
| | - Ingrid McCarroll
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, Australia
| | - Zhengzhi Zhao
- Collaborative Innovation Center of Steel Technology, University of Science and Technology Beijing, Beijing, China
| | - Wei Li
- Institute of Advanced Steels and Materials, School of Materials Science and Engineering, Shanghai Jiao Tong University, Shanghai, China
| | | | - Julie M Cairney
- Australian Centre for Microscopy and Microanalysis, The University of Sydney, Sydney, Australia. .,School of Aerospace, Mechanical and Mechatronic Engineering, The University of Sydney, Sydney, Australia
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31
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Abstract
Atom probe tomography is a well-established analytical instrument for imaging the 3D structure and composition of materials with high mass resolution, sub-nanometer spatial resolution and ppm elemental sensitivity. Thanks to recent hardware developments in Atom Probe Tomography (APT), combined with progress on site-specific focused ion beam (FIB)-based sample preparation methods and improved data treatment software, complex materials can now be routinely investigated. From model samples to complex, usable porous structures, there is currently a growing interest in the analysis of catalytic materials. APT is able to probe the end state of atomic-scale processes, providing information needed to improve the synthesis of catalysts and to unravel structure/composition/reactivity relationships. This review focuses on the study of catalytic materials with increasing complexity (tip-sample, unsupported and supported nanoparticles, powders, self-supported catalysts and zeolites), as well as sample preparation methods developed to obtain suitable specimens for APT experiments.
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32
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Ti and its alloys as examples of cryogenic focused ion beam milling of environmentally-sensitive materials. Nat Commun 2019; 10:942. [PMID: 30808943 PMCID: PMC6391424 DOI: 10.1038/s41467-019-08752-7] [Citation(s) in RCA: 60] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2018] [Accepted: 01/22/2019] [Indexed: 11/09/2022] Open
Abstract
Hydrogen pick-up leading to hydride formation is often observed in commercially pure Ti (CP-Ti) and Ti-based alloys prepared for microscopic observation by conventional methods, such as electro-polishing and room temperature focused ion beam (FIB) milling. Here, we demonstrate that cryogenic FIB milling can effectively prevent undesired hydrogen pick-up. Specimens of CP-Ti and a Ti dual-phase alloy (Ti-6Al-2Sn-4Zr-6Mo, Ti6246, in wt.%) were prepared using a xenon-plasma FIB microscope equipped with a cryogenic stage reaching −135 °C. Transmission electron microscopy (TEM), selected area electron diffraction, and scanning TEM indicated no hydride formation in cryo-milled CP-Ti lamellae. Atom probe tomography further demonstrated that cryo-FIB significantly reduces hydrogen levels within the Ti6246 matrix compared with conventional methods. Supported by molecular dynamics simulations, we show that significantly lowering the thermal activation for H diffusion inhibits undesired environmental hydrogen pick-up during preparation and prevents pre-charged hydrogen from diffusing out of the sample, allowing for hydrogen embrittlement mechanisms of Ti-based alloys to be investigated at the nanoscale. Hydrogen contamination in metals during sample preparation for high-resolution microscopy remains a challenge, especially when hydrogen itself is being investigated. Here, the authors show that using cryogenic milling significantly reduces hydrogen pick-up during sample preparation of titanium and titanium alloys.
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