Anisotropic size effect in strength in coherent nanowires with tilted twins
文献类型：期刊论文
| 作者 | Wei YJ(魏宇杰)
|
| 刊名 | Physical Review B
 |
| 出版日期 | 2011 |
| 卷号 | 84期号:1页码:14107 |
| 通讯作者邮箱 | yujie_wei@lnm.imech.ac.cn |
| 关键词 | Single-Crystal Mechanical-Properties Molecular-Dynamics Maximum Strength Gold Nanowires Deformation Metals Copper Microcompression Plasticity |
| ISSN号 | 1098-0121 |
| 产权排序 | Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China |
| 通讯作者 | Wei, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China |
| 中文摘要 | When materials are deformed plastically via dislocations, a general finding is that samples with smaller dimensions exhibit higher strengths but with very limited amount of plasticity in tension. Here we report that one-dimensional coherent nanostructures with tilted internal twins exhibit anisotropic size effect: their strengths show no apparent change if only their thicknesses reduce, but become stronger as the sample sizes are reduced proportionally. Large-scale molecular dynamics simulations show that such nanowires deform primarily through twin migration mediated by partial dislocations in one active slip system, and a large amount of plasticity could be achieved in such nanowires via twin migration. The unique structure shown here is suitable to explore strengthening mechanisms in metals when plasticity is controlled by a single dislocation slip system. This study also suggests a novel approach to modulate strength and ductility in one-dimensional coherent nanostructures. |
| 学科主题 | Physics |
| 分类号 | 二类/Q1 |
| 类目[WOS] | Physics, Condensed Matter |
| 研究领域[WOS] | Physics |
| 关键词[WOS] | SINGLE-CRYSTAL ; MECHANICAL-PROPERTIES ; MOLECULAR-DYNAMICS ; MAXIMUM STRENGTH ; GOLD NANOWIRES ; DEFORMATION ; METALS ; COPPER ; MICROCOMPRESSION ; PLASTICITY |
| 收录类别 | SCI |
| 资助信息 | The author is very grateful to Huajian Gao and Allan F. Bower of Brown University for fruitful discussions. This work was supported in part by the Hundred Talent Program and by NSFC No. 11021262. Computation was supported by the Super Computing Center of CAS and the Institute of Mechanics. |
| 原文出处 | http://dx.doi.org/10.1103/PhysRevB.84.014107 |
| 语种 | 英语 |
| WOS记录号 | WOS:000293004800001 |
| 公开日期 | 2012-04-01 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/44918]  |
| 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. Anisotropic size effect in strength in coherent nanowires with tilted twins[J]. Physical Review B,2011,84(1):14107. |
| APA | 魏宇杰.(2011).Anisotropic size effect in strength in coherent nanowires with tilted twins.Physical Review B,84(1),14107. |
| MLA | 魏宇杰."Anisotropic size effect in strength in coherent nanowires with tilted twins".Physical Review B 84.1(2011):14107. |
入库方式： OAI收割
来源：力学研究所
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