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Li T, Li N, Yu T, Zheng G. The Modulation of Compositional Heterogeneity for Controlling Shear Banding in Co-P Metallic Nanoglasses. NANOMATERIALS (BASEL, SWITZERLAND) 2024; 14:993. [PMID: 38921869 PMCID: PMC11206517 DOI: 10.3390/nano14120993] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2024] [Revised: 06/04/2024] [Accepted: 06/05/2024] [Indexed: 06/27/2024]
Abstract
Shear banding is much dependent on the glass-glass interfaces (GGIs) in metallic nanoglasses (NGs). Nevertheless, the current understanding of the glass phase of GGIs is not well established for controlling the shear banding in NGs. In this study, Co-P NGs are investigated by molecular dynamics simulations to reveal the phenomenon of elemental segregation in the GGI regions where the content of Co is dominant. Specifically, Co segregation results in the formation of GGIs, whose atomic structures are comparatively less dense than those present in the interiors of glassy grains. It is suggested that the Co segregation significantly reduces the shear resistance of GGIs. Thus, such compositional heterogeneity influences the mechanical properties of Co-P NGs. Particularly, shear banding is much altered through enhancing the Co segregation in the GGI regions, which leads to improvements in the ductility of Co-P NGs. This study advances knowledge of the formation of the GGI phase in NGs, which could enable GGI engineering in enhancing the mechanical properties of NGs.
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Affiliation(s)
- Tian Li
- CDGM Glass Co., Ltd., Chengdu 610199, China
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong SAR 999077, China
| | - Nana Li
- CDGM Glass Co., Ltd., Chengdu 610199, China
| | - Tianlai Yu
- CDGM Glass Co., Ltd., Chengdu 610199, China
- Chengdu Guangming Paite Precious Metal Co., Ltd., Chengdu 610199, China
| | - Guangping Zheng
- Department of Mechanical Engineering, The Hong Kong Polytechnic University, Hong Kong SAR 999077, China
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Zhang J, Gao P, Zhang W. Influence of the Hydrogen Doping Method on the Atomic Structure, Mechanical Properties and Relaxation Behaviors of Metallic Glasses. MATERIALS (BASEL, SWITZERLAND) 2023; 16:1731. [PMID: 36837363 PMCID: PMC9961258 DOI: 10.3390/ma16041731] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/28/2022] [Revised: 02/12/2023] [Accepted: 02/16/2023] [Indexed: 06/18/2023]
Abstract
The interaction of metallic glasses (MGs) with hydrogen can trigger many interesting physical, chemical and mechanical phenomena. However, atomic-scale understanding is still lacking. In this work, molecular dynamics (MD) simulations are employed to study the atomic structure, mechanical properties and relaxation behaviors of H-doped Ni50Al50 MGs doped by two methods. The properties of H-doped MGs are determined not only by the hydrogen content but also by the doping method. When H atoms are doped into the molten state of samples, H atoms can fully diffuse and interact with metallic atoms, resulting in loose local atomic structures, homogeneous deformation and enhanced β relaxation. In contrast, when H atoms are doped into as-cast MGs, the H content is crucial in affecting the atomic structure and mechanical properties. A small number of H atoms has little influence on the elastic matrix, while the percolation of shear transformation zones (STZs) is hindered by H atoms, resulting in the delay of shear band (SB) formation and an insignificant change in the strength. However, a large number of H atoms can make the elastic matrix loose, leading to the decrease in strength and the transition of the deformation mode from SB to homogeneous deformation. The H effects on the elastic matrix and flow units are also applied to the dynamic relaxation. The deformability of H-doped Ni50Al50 MGs is enhanced by both H-doping methods; however, our results reveal that the mechanisms are different.
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Affiliation(s)
- Jiacheng Zhang
- State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China
| | - Pengfei Gao
- Northwest Institute of Nuclear Technology, Xi’an 710024, China
| | - Weixu Zhang
- State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace Engineering, Xi’an Jiaotong University, Xi’an 710049, China
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Idrissi H, Ghidelli M, Béché A, Turner S, Gravier S, Blandin JJ, Raskin JP, Schryvers D, Pardoen T. Atomic-scale viscoplasticity mechanisms revealed in high ductility metallic glass films. Sci Rep 2019; 9:13426. [PMID: 31530850 PMCID: PMC6749058 DOI: 10.1038/s41598-019-49910-7] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Accepted: 09/03/2019] [Indexed: 11/23/2022] Open
Abstract
The fundamental plasticity mechanisms in thin freestanding Zr65Ni35 metallic glass films are investigated in order to unravel the origin of an outstanding strength/ductility balance. The deformation process is homogenous until fracture with no evidence of catastrophic shear banding. The creep/relaxation behaviour of the films was characterized by on-chip tensile testing, revealing an activation volume in the range 100-200 Å3. Advanced high-resolution transmission electron microscopy imaging and spectroscopy exhibit a very fine glassy nanostructure with well-defined dense Ni-rich clusters embedded in Zr-rich clusters of lower atomic density and a ~2-3 nm characteristic length scale. Nanobeam electron diffraction analysis reveals that the accumulation of plastic deformation at room-temperature correlates with monotonously increasing disruption of the local atomic order. These results provide experimental evidences of the dynamics of shear transformation zones activation in metallic glasses. The impact of the nanoscale structural heterogeneities on the mechanical properties including the rate dependent behaviour is discussed, shedding new light on the governing plasticity mechanisms in metallic glasses with initially heterogeneous atomic arrangement.
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Affiliation(s)
- Hosni Idrissi
- Institute of Mechanics, Materials and Civil Engineering, UCLouvain, B-1348, Louvain-la-Neuve, Belgium.
- EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium.
| | - Matteo Ghidelli
- Institute of Mechanics, Materials and Civil Engineering, UCLouvain, B-1348, Louvain-la-Neuve, Belgium
- Science and engineering of materials and processes, SIMaP, Université de Grenoble/CNRS, UJF/Grenoble INP, BP46, 38402, Saint-Martin d'Hères, France
- Institute of information and communication technologies, electronics and applied mathematics, ICTEAM, UCLouvain, B-1348, Louvain-la-Neuve, Belgium
| | - Armand Béché
- EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium
| | - Stuart Turner
- EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium
| | - Sébastien Gravier
- Science and engineering of materials and processes, SIMaP, Université de Grenoble/CNRS, UJF/Grenoble INP, BP46, 38402, Saint-Martin d'Hères, France
| | - Jean-Jacques Blandin
- Science and engineering of materials and processes, SIMaP, Université de Grenoble/CNRS, UJF/Grenoble INP, BP46, 38402, Saint-Martin d'Hères, France
| | - Jean-Pierre Raskin
- Institute of information and communication technologies, electronics and applied mathematics, ICTEAM, UCLouvain, B-1348, Louvain-la-Neuve, Belgium
| | - Dominique Schryvers
- EMAT, University of Antwerp, Groenenborgerlaan 171, B-2020, Antwerp, Belgium
| | - Thomas Pardoen
- Institute of Mechanics, Materials and Civil Engineering, UCLouvain, B-1348, Louvain-la-Neuve, Belgium
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Jian WR, Wang L, Yao XH, Luo SN. Balancing strength, hardness and ductility of Cu 64Zr 36 nanoglasses via embedded nanocrystals. NANOTECHNOLOGY 2018; 29:025701. [PMID: 29211689 DOI: 10.1088/1361-6528/aa994f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Superplasticity can be achieved in nanoglasses but at the expense of strength, and such a loss can be mitigated via embedding stronger nanocrystals, i.e., forming nanoglass/nanocrystal composites. As an illustrative case, we investigate plastic deformation of Cu64Zr36 nanoglass/nanocrystalline Cu composites during uniaxial tension and nanoindentation tests with molecular dynamics simulations. With an increasing fraction of nanocrystalline grains, the tensile strength of the composite is enhanced, while its ductility decreases. The dominant interface type changes from a glass-glass interface to glass-crystal interface to grain boundary, corresponding to a failure mode transition from superplastic flow to shear banding to brittle intercrystal fracture, respectively. Accordingly, the indentation hardness increases continuously and strain localization beneath the indenter is more and more severe. For an appropriate fraction of nanocrystalline grains, a good balance among strength, hardness and ductility can be realized, which is useful for the synthesis of novel nanograined glass/crystalline composites with high strength, high hardness and superior ductility.
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Affiliation(s)
- W R Jian
- Department of Engineering Mechanics, South China University of Technology, Guangzhou, Guangdong 510640, People's Republic of China. Key Laboratory of Advanced Technologies of Materials, Ministry of Education, Southwest Jiaotong University, Chengdu, Sichuan 610031, People's Republic of China. The Peac Institute of Multiscale Sciences, Chengdu, Sichuan 610031, People's Republic of China
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Peng CX, Song KK, Wang L, Şopu D, Pauly S, Eckert J. Correlation between structural heterogeneity and plastic deformation for phase separating FeCu metallic glasses. Sci Rep 2016; 6:34340. [PMID: 27681052 PMCID: PMC5041185 DOI: 10.1038/srep34340] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 09/12/2016] [Indexed: 11/12/2022] Open
Abstract
Unlike crystalline metals, the plastic deformation of metallic glasses (MGs) involves a competition between disordering and structural relaxation ordering, which is not well understood, yet. Molecular dynamics (MD) simulations were performed to investigate the evolutions of strain localizations, short-range order (SRO) as well as the free volume in the glass during compressive deformation of Fe50Cu50 MGs with different degrees of phase separation. Our findings indicate that the free volume in the phase separating MGs decreases while the shear strain localizations increase with increasing degree of phase separation. Cu-centered clusters show higher potential energies and Voronoi volumes, and bear larger local shear strains. On the other hand, Fe-centered pentagon-rich clusters in Cu-rich regions seem to play an important role to resist the shear transformation. The dilatation or annihilation of Voronoi volumes is due to the competition between ordering via structural relaxation and shear stress-induced deformation. The present study could provide a better understanding of the relationship between the structural inhomogeneity and the deformation of MGs.
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Affiliation(s)
- Chuan-Xiao Peng
- School of Mechanical, Electrical & Information Engineering, Shandong University (Weihai), WenhuaXilu 180, 264209 Weihai, P.R. China
| | - Kai-Kai Song
- School of Mechanical, Electrical & Information Engineering, Shandong University (Weihai), WenhuaXilu 180, 264209 Weihai, P.R. China
| | - Li Wang
- School of Mechanical, Electrical & Information Engineering, Shandong University (Weihai), WenhuaXilu 180, 264209 Weihai, P.R. China
| | - Daniel Şopu
- IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069 Dresden, Germany
| | - Simon Pauly
- IFW Dresden, Institute for Complex Materials, Helmholtzstraße 20, D-01069 Dresden, Germany
| | - Jürgen Eckert
- ErichSchmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstraße 12, A-8700 Leoben, Austria
- Department Materials Physics, Montanuniversität Leoben, Jahnstraße 12, A-8700 Leoben, Austria
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Şopu D, Foroughi A, Stoica M, Eckert J. Brittle-to-Ductile Transition in Metallic Glass Nanowires. NANO LETTERS 2016; 16:4467-4471. [PMID: 27248329 DOI: 10.1021/acs.nanolett.6b01636] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
When reducing the size of metallic glass samples down to the nanoscale regime, experimental studies on the plasticity under uniaxial tension show a wide range of failure modes ranging from brittle to ductile ones. Simulations on the deformation behavior of nanoscaled metallic glasses report an unusual extended strain softening and are not able to reproduce the brittle-like fracture deformation as found in experiments. Using large-scale molecular dynamics simulations we provide an atomistic understanding of the deformation mechanisms of metallic glass nanowires and differentiate the extrinsic size effects and aspect ratio contribution to plasticity. A model for predicting the critical nanowire aspect ratio for the ductile-to-brittle transition is developed. Furthermore, the structure of brittle nanowires can be tuned to a softer phase characterized by a defective short-range order and an excess free volume upon systematic structural rejuvenation, leading to enhanced tensile ductility. The presented results shed light on the fundamental deformation mechanisms of nanoscaled metallic glasses and demarcate ductile and catastrophic failure.
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Affiliation(s)
- D Şopu
- IFW Dresden, Institut für Komplexe Materialien, Helmholtzstraße 20, D-01069 Dresden, Germany
| | - A Foroughi
- IFW Dresden, Institut für Komplexe Materialien, Helmholtzstraße 20, D-01069 Dresden, Germany
| | - M Stoica
- IFW Dresden, Institut für Komplexe Materialien, Helmholtzstraße 20, D-01069 Dresden, Germany
- Politehnica University of Timisoara , P-ta Victoriei 2, RO-300006 Timisoara, Romania
| | - J Eckert
- Erich Schmid Institute of Materials Science, Austrian Academy of Sciences , Jahnstrasse 12, A-8700 Leoben, Austria
- Department Materials Physics, Mountanuniversität Leoben , Jahnstrasse 12, A-8700 Leoben, Austria
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Zhang JC, Chen C, Pei QX, Wan Q, Zhang WX, Sha ZD. Deformation and failure mechanisms of nanoscale cellular structures of metallic glasses. RSC Adv 2016. [DOI: 10.1039/c6ra22483k] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Cellular metallic glasses (MGs) can be good candidates for structural and functional applications due to their light weight, enhanced ductility and excellent energy absorption performance.
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Affiliation(s)
- J. C. Zhang
- State Key Laboratory for Strength and Vibration of Mechanical Structures
- School of Aerospace Engineering
- Xi'an Jiaotong University
- Xi'an 710049
- China
| | - C. Chen
- State Key Laboratory of Mechanics and Control of Mechanical Structures
- Nanjing University of Aeronautics and Astronautics
- Nanjing 210016
- China
| | - Q. X. Pei
- Institute of High Performance Computing
- A*STAR
- Singapore
| | - Q. Wan
- Institute of System Engineering
- China Academy of Engineering Physics
- MianYang
- China
| | - W. X. Zhang
- State Key Laboratory for Strength and Vibration of Mechanical Structures
- School of Aerospace Engineering
- Xi'an Jiaotong University
- Xi'an 710049
- China
| | - Z. D. Sha
- International Center for Applied Mechanics
- State Key Laboratory for Strength and Vibration of Mechanical Structures
- Xi'an Jiaotong University
- Xi'an 710049
- China
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Sha ZD, Branicio PS, Pei QX, Liu ZS, Lee HP, Tay TE, Wang TJ. Strong and superplastic nanoglass. NANOSCALE 2015; 7:17404-17409. [PMID: 26437684 DOI: 10.1039/c5nr04740d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The strength-ductility tradeoff has been a common long-standing dilemma in materials science. For example, superplasticity with a tradeoff in strength has been reported for Cu50Zr50 nanoglass (NG) with grain sizes below 5 nm. Here we report an improvement in strength without sacrificing superplasticity in Cu50Zr50 NG by using a bimodal grain size distribution. Our results reveal that large grains impart high strength, which is in striking contrast to the physical origin of the improvement in strength reported in the traditional nanostructured metals/alloys. Furthermore, the mechanical properties of NG with a bimodal nanostructure depend critically upon the fraction of large grains. By increasing the fraction of the large grains, a transition from superplastic flow to failure by shear banding is clearly observed. We expect that these results will be useful in the development of a novel strong and superplastic NG.
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Affiliation(s)
- Z D Sha
- International Center for Applied Mechanics, State Key Laboratory for Strength and Vibration of Mechanical Structures, Xi'an Jiaotong University, Xi'an 710049, China.
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Adibi S, Branicio PS, Joshi SP. Suppression of Shear Banding and Transition to Necking and Homogeneous Flow in Nanoglass Nanopillars. Sci Rep 2015; 5:15611. [PMID: 26503114 PMCID: PMC4621512 DOI: 10.1038/srep15611] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2015] [Accepted: 09/28/2015] [Indexed: 11/18/2022] Open
Abstract
In order to improve the properties of metallic glasses (MG) a new type of MG structure, composed of nanoscale grains, referred to as nanoglass (NG), has been recently proposed. Here, we use large-scale molecular dynamics (MD) simulations of tensile loading to investigate the deformation and failure mechanisms of Cu64Zr36 NG nanopillars with large, experimentally accessible, 50 nm diameter. Our results reveal NG ductility and failure by necking below the average glassy grain size of 20 nm, in contrast to brittle failure by shear band propagation in MG nanopillars. Moreover, the results predict substantially larger ductility in NG nanopillars compared with previous predictions of MD simulations of bulk NG models with columnar grains. The results, in excellent agreement with experimental data, highlight the substantial enhancement of plasticity induced in experimentally relevant MG samples by the use of nanoglass architectures and point out to exciting novel applications of these materials.
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Affiliation(s)
- Sara Adibi
- Institute of High Performance Computing, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632
- Department of Mechanical Engineering, National University of Singapore, 117576, Singapore
| | - Paulo S. Branicio
- Institute of High Performance Computing, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632
| | - Shailendra P. Joshi
- Department of Mechanical Engineering, National University of Singapore, 117576, Singapore
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