The kinetics and energetics of dislocation mediated de-twinning in nano-twinned face-centered cubic metals
文献类型：期刊论文
| 作者 | Wei YJ(魏宇杰)
|
| 刊名 | Materials Science and Engineering A-Structural Materials Properties Microstructure and Processing
 |
| 出版日期 | 2011 |
| 卷号 | 528期号:3页码:1558-1566 |
| 通讯作者邮箱 | yujie_wei@lnm.imech.ac.cn |
| 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 |
| ISSN号 | 0921-5093 |
| 产权排序 | Chinese Acad Sci, State Key Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China |
| 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 |
| 中文摘要 | 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. |
| 学科主题 | Science & Technology - Other Topics; Materials Science |
| 分类号 | 一类 |
| 类目[WOS] | Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary ; Metallurgy & Metallurgical Engineering |
| 研究领域[WOS] | Science & Technology - Other Topics ; Materials Science ; Metallurgy & Metallurgical Engineering |
| 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 |
| 收录类别 | SCI ; EI |
| 资助信息 | 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. |
| 原文出处 | http://dx.doi.org/10.1016/j.msea.2010.10.072 |
| 语种 | 英语 |
| WOS记录号 | WOS:000286904300111 |
| 公开日期 | 2012-04-01 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/44949]  |
| 专题 | 力学研究所_非线性力学国家重点实验室 |
| 推荐引用方式 GB/T 7714 | 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.(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."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. |
入库方式： OAI收割
来源：力学研究所
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