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Wang S, Zhang C, Li X, Wang J. Heterophase Interface Dominated Deformation and Mechanical Properties in Al‐Cu‐Li Alloys. ADVANCED THEORY AND SIMULATIONS 2021. [DOI: 10.1002/adts.202100059] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shuo Wang
- School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China
| | - Chi Zhang
- School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China
| | - Xin Li
- School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China
| | - Junsheng Wang
- School of Materials Science and Engineering, and Advanced Research Institute of Multidisciplinary Science Beijing Institute of Technology Beijing 100081 China
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Zhang S, Zhang Q, Liu Z, Legut D, Germann TC, Veprek S, Zhang H, Zhang R. Ultrastrong π-Bonded Interface as Ductile Plastic Flow Channel in Nanostructured Diamond. ACS APPLIED MATERIALS & INTERFACES 2020; 12:4135-4142. [PMID: 31880903 DOI: 10.1021/acsami.9b19725] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A combinational effect of nanostructured crystallites and π-bonded interfaces is much attractive in solving the conflict between strength/hardness and toughness to design extrinsically superhard materials with enhanced fracture toughness and/or other properties such as tunable electronic properties. In the present work, taking the experimentally observed π-bonded interfaces in nanostructured diamond as the prototype, we theoretically investigated their stabilities, electronic structures, and mechanical strengths with special consideration of the size effect of nanocrystallites or nanolayers. It is unprecedentedly found that the π-bonded interfaces exhibit tunable electronic semiconducting properties, superior fracture toughness, and anomalously large creep-like plasticity at the cost of minor losses in strength/hardness; such unique combination is uncovered to be attributed to the ductile bridging effect of the sp2 bonds across the π-bonded interface that dominates the localized plastic flow channel. As the length scale of nanocrystallites/nanolayers is lower than a critical value, however, the first failure occurring inside nanocrystallites/nanolayers features softening and embrittling. These findings not only provide a novel insight into the unique strengthening and toughening origin observed in ultrahard nanostructured diamonds consisting of nanotwins, nanocomposites, and nanocrystallites but also highlight a unique pathway by combining the nanostructured crystallites and the strongly bonded interface to design the novel superhard materials with superior toughness.
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Affiliation(s)
- Shihao Zhang
- School of Materials Science and Engineering , Beihang University , Beijing 100191 , P. R. China
- Center for Integrated Computational Materials Engineering (International Research Institute for Multidisciplinary Science) and Key Laboratory of High-Temperature Structural Materials & Coatings Technology (Ministry of Industry and Information Technology) , Beihang University , Beijing 100191 , P. R. China
| | - Qi Zhang
- School of Materials Science and Engineering , Beihang University , Beijing 100191 , P. R. China
- Center for Integrated Computational Materials Engineering (International Research Institute for Multidisciplinary Science) and Key Laboratory of High-Temperature Structural Materials & Coatings Technology (Ministry of Industry and Information Technology) , Beihang University , Beijing 100191 , P. R. China
| | - Zhaorui Liu
- School of Materials Science and Engineering , Beihang University , Beijing 100191 , P. R. China
- Center for Integrated Computational Materials Engineering (International Research Institute for Multidisciplinary Science) and Key Laboratory of High-Temperature Structural Materials & Coatings Technology (Ministry of Industry and Information Technology) , Beihang University , Beijing 100191 , P. R. China
| | - Dominik Legut
- IT4Innovations , VSB-Technical University of Ostrava , 17. listopadu 2172/15 , 708 00 Ostrava , Czech Republic
- Nanotechnology Centre , VSB-Technical University of Ostrava , 17. listopadu 2172/15 , 708 00 Ostrava , Czech Republic
| | - Timothy C Germann
- Theoretical Division , Los Alamos National Laboratory , Los Alamos , New Mexico 87545 , United States
| | - Stan Veprek
- Department of Chemistry , Technical University Munich , Lichtenbergstrasse 4 , D-85747 Garching , Germany
| | - Haijun Zhang
- National United Engineering Laboratory for Biomedical Material Modification , Dezhou , Shandong 251100 , P. R. China
- Department of Vascular Intervention , Tenth People's Hospital of Tongji University , Shanghai 200072 , China
| | - Ruifeng Zhang
- School of Materials Science and Engineering , Beihang University , Beijing 100191 , P. R. China
- Center for Integrated Computational Materials Engineering (International Research Institute for Multidisciplinary Science) and Key Laboratory of High-Temperature Structural Materials & Coatings Technology (Ministry of Industry and Information Technology) , Beihang University , Beijing 100191 , P. R. China
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Abstract
A poor interface or defected interfacial segment may trigger interfacial cracking, loss of physical and mechanical functions, and eventual failure of entire material system. Here we show a novel method to diagnose local interphase boundary based on interfacial electron work function (EWF) and its gradient across the interface, which can be analyzed using a nano-Kelvin probe with atomic force microscope. It is demonstrated that a strong interface has its electron work function gradually changed across the interface, while a weaker one shows a steeper change in EWF across the interface. Both experimental and theoretical analyses show that the interfacial work function gradient is a measure of the interaction between two sides of the interface. The effectiveness of this method is demonstrated by analyzing sample metal-metal and metal-ceramic interfaces.
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Zhang Z, Zhang RF, Legut D, Li DQ, Zhang SH, Fu ZH, Guo HB. Pinning effect of reactive elements on adhesion energy and adhesive strength of incoherent Al2O3/NiAl interface. Phys Chem Chem Phys 2016; 18:22864-73. [PMID: 27480916 DOI: 10.1039/c6cp03609k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The profound effects of reactive elements (REs) on the adhesion energy and adhesive strength of the α-Al2O3/β-NiAl interface in thermal barrier coating (TBC) systems have attracted increasing attention because RE-doping has played a significant role in improving the thermal cycling lifetime of TBCs. However, the fundamental mechanism is, so far, not well understood due to the experimental difficulty and theoretical complexity in interface modelling. For this purpose, in the present study we have performed comprehensive density functional theory calculations and information targeted experiments to underline the origin of the surprising enhancement of interface adhesion, stability and mechanical strength of the α-Al2O3/β-NiAl interface by different RE doping levels. Our results suggest that the interface failure firstly appears within the NiAl layer adjacent to the Al-terminated oxide under mechanical loading, while the formation of O-RE-Ni bond pairs at the interface can effectively hinder the interface de-cohesion, providing a higher mechanical strength. By comparing several typical REs, it is observed that Hf can emerge not only with the highest interface adhesion energy, but also the highest mechanical strength; in agreement with our experimental results. By continuously increasing the dopant concentration, the strengthening effect may increase correspondingly, but is limited by the solute solubility. These results shed light into the effect of REs on the stability and strength of the α-Al2O3/β-NiAl interface, providing theoretical guidance for interface design via a combinational analysis of bond topology and electronic structure.
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Affiliation(s)
- Z Zhang
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China. and Center for Integrated Computational Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, P. R. China
| | - R F Zhang
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China. and Center for Integrated Computational Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, P. R. China
| | - D Legut
- IT4 Innovations Center, VSB-Technical University of Ostrava, CZ-70833 Ostrava, Czech Republic
| | - D Q Li
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China.
| | - S H Zhang
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China. and Center for Integrated Computational Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, P. R. China
| | - Z H Fu
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China. and Center for Integrated Computational Engineering, International Research Institute for Multidisciplinary Science, Beihang University, Beijing 100191, P. R. China
| | - H B Guo
- School of Materials Science and Engineering, Beihang University, Beijing 100191, P. R. China.
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Abstract
Important properties of materials are strongly influenced or controlled by the presence of solid interfaces, i.e. from the atomic arrangement in a region which is a few atomic spacing wide. Using the quantitative analysis of atom column positions enabled by CS-corrected transmission electron microscopy and theoretical calculations, atom behaviors at and adjacent to the interface was carefully explored. A regular variation of Cu interplanar spacing at a representative metal-ceramic interface was experimentally revealed, i.e. Cu-MgO (001). We also found the periodic fluctuations of the Cu and Mg atomic positions triggered by the interfacial geometrical misfit dislocations, which are partially verified by theoretical calculations using empirical potential approach. Direct measurements of the bond length of Cu-O at the coherent regions of the interface showed close correspondence with theoretical results. By successively imaging of geometrical misfit dislocations at different crystallographic directions, the strain fields around the interfacial geometrical misfit dislocation are quantitatively demonstrated at a nearly three-dimensional view. A quantitative evaluation between the measured and calculated strain fields using simplified model around the geometrical misfit dislocation is shown.
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Ivashchenko V, Veprek S, Pogrebnjak A, Postolnyi B. First-principles quantum molecular dynamics study of Ti x Zr 1-x N(111)/SiN y heterostructures and comparison with experimental results. SCIENCE AND TECHNOLOGY OF ADVANCED MATERIALS 2014; 15:025007. [PMID: 27877668 PMCID: PMC5090419 DOI: 10.1088/1468-6996/15/2/025007] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 03/30/2014] [Accepted: 01/16/2014] [Indexed: 06/06/2023]
Abstract
The heterostructures of five monolayers B1-Ti x Zr1-x N(111), x = 1.0, 0.6, 0.4 and 0.0 (where B1 is a NaCl-type structure) with one monolayer of a Si3N4-like Si2N3 interfacial layer were investigated by means of first-principles quantum molecular dynamics and a structure optimization procedure using the Quantum ESPRESSO code. Slabs consisting of stoichiometric TiN and ZrN and random, as well as segregated, B1-Ti x Zr1-x N(111) solutions were considered. The calculations of the B1-Ti x Zr1-x N solid solutions, as well as of the heterostructures, showed that the pseudo-binary TiN-ZrN system exhibits a miscibility gap. The segregated heterostructures in which Zr atoms surround the Si y N z interface were found to be the most stable. For the Zr-rich heterostructures, the total energy of the random solid solution was lower compared to that of the segregated one, whereas for the Ti-rich heterostructures the opposite tendency was observed. Hard and super hard Zr-Ti-Si-N coatings with thicknesses from 2.8 to 3.5 μm were obtained using a vacuum arc source with high frequency stimulation. The samples were annealed in a vacuum and in air at 1200 °C. Experimental investigations of Zr-Ti-N, Zr-Ti-Si-N and Ti-Si-N coatings with different Zr, Ti and Si concentrations were carried out for comparison with results obtained from Ti x Zr 1-x N(111)/SiN y systems. During annealing, the hardness of the best series samples was increased from (39.6 ± 1.4) to 53.6 GPa, which seemed to indicate that a spinodal segregation along grain interfaces was finished. A maximum hardness of 40.8 GPa before and 55 GPa after annealing in air at 500 °C was observed for coatings with a concentration of elements of Si≽ (7-8) at.%, Ti ≽ 22 at.% and Zr ⩽ 70 at.%.
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Affiliation(s)
- Volodymyr Ivashchenko
- Institute of Problems of Material Science, NAS of Ukraine, Krzhyzhanovsky Street 3, 03142, Kyiv, Ukraine
| | - Stan Veprek
- Department of Chemistry, Technical University Munich, Lichtenbergstrasse 4, D-85747, Garching, Germany
| | | | - Bogdan Postolnyi
- Sumy State University, Rymsky-Korsakov Street 2, 40007, Sumy, Ukraine
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Luo Q, Wang SC, Zhou Z, Chen L. Structure characterization and tribological study of magnetron sputtered nanocomposite nc-TiAlV(N,C)/a-C coatings. ACTA ACUST UNITED AC 2011. [DOI: 10.1039/c1jm10707k] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bäcker A, Dietz B, Friedrich T, Miski-Oglu M, Richter A, Schäfer F, Tomsovic S. Friedel oscillations in microwave billiards. PHYSICAL REVIEW. E, STATISTICAL, NONLINEAR, AND SOFT MATTER PHYSICS 2009; 80:066210. [PMID: 20365257 DOI: 10.1103/physreve.80.066210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2009] [Indexed: 05/29/2023]
Abstract
Friedel oscillations of electron densities near step edges have an analog in microwave billiards. A random plane-wave model, normally only appropriate for the eigenfunctions of a purely chaotic system, can be applied and is tested for non-purely-chaotic dynamical systems with measurements on pseudointegrable and mixed dynamics geometries. It is found that the oscillations in the pseudointegrable microwave cavity match the random plane-wave modeling. Separating the chaotic from the regular states for the mixed system requires incorporating an appropriate phase-space projection into the modeling in multiple ways for good agreement with experiment.
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Affiliation(s)
- A Bäcker
- Institut für Theoretische Physik, Technische Universität Dresden, Dresden, Germany
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