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The kinetics and energetics of dislocation mediated de-twinning in nano-twinned face-centered cubic metals
Wei YJ(魏宇杰); Wei, YJ (reprint author), Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Bei Si Huan Xi Rd 15, Beijing 100190, Peoples R China
Source PublicationMaterials Science and Engineering A-Structural Materials Properties Microstructure and Processing
2011
Volume528Issue:3Pages:1558-1566
ISSN0921-5093
AbstractPolycrystalline Cu with hierarchy microstructures - ultrafined grains about 500 nm and included twins several to tens of nanometers thick - show maximum strength at an averaged twin thickness of 15 nm. Li et al. Nature 464 (2010) 877-880 (Ref. [1]), reported that the primary plastic deformation transits from inclined dislocation gliding to de-twinning in nano-twinned (nt) Cu when twin thicknesses decrease from 25 nm to 4 nm. Their investigation showed that enhanced tie-twinning accounts for the strength softening in nt-Cu. From the kinetic and energetic aspects of de-twining process, we present respectively two models. In the kinetic model, we assume that thermally activated dislocation nucleation is the controlling mechanism for plastic deformation, while the transformation energy associated with de-twinning is considered to be governing in the energetic model. Applications of the models on strain-rate sensitivity and temperature dependence of strengths in nt-Cu suggest that the energetic mechanism also plays an important role for de-twinning in nt-Cu. (C) 2010 Elsevier B.V. All rights reserved.
KeywordDe-twinning Twinning Nano-twinned Polycrystalline Strength Softening Strain-rate Sensitivity Molecular-dynamics Simulation Nanocrystalline Fcc Metals Embedded-atom-method Nanoscale Twins Mechanical-behavior Nanotwinned Copper Deformation Mechanisms Nanostructured Metals Plastic-deformation
Subject AreaScience & Technology - Other Topics ; Materials Science
DOI10.1016/j.msea.2010.10.072
URL查看原文
Indexed BySCI ; EI
Language英语
WOS IDWOS:000286904300111
WOS KeywordSTRAIN-RATE SENSITIVITY ; MOLECULAR-DYNAMICS SIMULATION ; NANOCRYSTALLINE FCC METALS ; EMBEDDED-ATOM-METHOD ; NANOSCALE TWINS ; MECHANICAL-BEHAVIOR ; NANOTWINNED COPPER ; DEFORMATION MECHANISMS ; NANOSTRUCTURED METALS ; PLASTIC-DEFORMATION
WOS Research AreaScience & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS SubjectNanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
Funding OrganizationY.W. is very thankful to Professor Huajian Gao and Dr. Xiaoyan Li at Brown University for fruitful discussions. Financial support by the "Hundred Talent Program" from the Chinese Academy of Sciences is acknowledged.
DepartmentLNM微结构计算力学(筹)
Classification一类
Citation statistics
Document Type期刊论文
Identifierhttp://dspace.imech.ac.cn/handle/311007/44949
Collection非线性力学国家重点实验室
Corresponding AuthorWei, YJ (reprint author), Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Bei Si Huan Xi Rd 15, Beijing 100190, Peoples R China
Recommended Citation
GB/T 7714
Wei YJ,Wei, YJ . The kinetics and energetics of dislocation mediated de-twinning in nano-twinned face-centered cubic metals[J]. Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing,2011,528(3):1558-1566.
APA 魏宇杰,&Wei, YJ .(2011).The kinetics and energetics of dislocation mediated de-twinning in nano-twinned face-centered cubic metals.Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing,528(3),1558-1566.
MLA 魏宇杰,et al."The kinetics and energetics of dislocation mediated de-twinning in nano-twinned face-centered cubic metals".Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing 528.3(2011):1558-1566.
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