The kinetics and energetics of dislocation mediated de-twinning in nano-twinned face-centered cubic metals

doi:10.1016/j.msea.2010.10.072

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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
发表期刊	Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
	2011
卷号	528 期号:3 页码:1558-1566
ISSN	0921-5093
摘要	Polycrystalline 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.
关键词	De-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
学科领域	Science & Technology - Other Topics ; Materials Science
DOI	10.1016/j.msea.2010.10.072
URL	查看原文
收录类别	SCI ; EI
语种	英语
WOS记录号	WOS:000286904300111
关键词[WOS]	STRAIN-RATE SENSITIVITY ; MOLECULAR-DYNAMICS SIMULATION ; NANOCRYSTALLINE FCC METALS ; EMBEDDED-ATOM-METHOD ; NANOSCALE TWINS ; MECHANICAL-BEHAVIOR ; NANOTWINNED COPPER ; DEFORMATION MECHANISMS ; NANOSTRUCTURED METALS ; PLASTIC-DEFORMATION
WOS研究方向	Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering
WOS类目	Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering
项目资助者	Y.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.
课题组名称	LNM微结构计算力学（筹）
论文分区	一类
引用统计	被引频次：64[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://dspace.imech.ac.cn/handle/311007/44949
专题	非线性力学国家重点实验室
通讯作者	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
推荐引用方式 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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