Size effects of primary/secondary twins on the atomistic deformation mechanisms in hierarchically nanotwinned metals
文献类型：期刊论文
| 作者 | Yuan FP(袁福平) ; Wu XL(武晓雷)
|
| 刊名 | JOURNAL OF APPLIED PHYSICS
 |
| 出版日期 | 2013-05-28 |
| 卷号 | 113期号:20页码:203516/1-203516/6 |
| 通讯作者邮箱 | fpyuan@lnm.imech.ac.cn |
| 关键词 | copper dislocations grain size hardening molecular dynamics method plastic flow size effect softening twin boundaries twinning yield stress |
| ISSN号 | 0021-8979 |
| 产权排序 | [Yuan, Fuping; Wu, Xiaolei] Chinese Acad Sci, State Kay Lab Nonlinear Mech, Inst Mech, Beijing 100190, Peoples R China |
| 通讯作者 | Yuan, FP(reprint author), Chinese Acad Sci, Inst Mech, LNM, Beijing 100190, Peoples R China. |
| 中文摘要 | A series of large-scale molecular dynamics simulations have been performed to investigate the tensile properties of nanotwinned (NT) copper with hierarchically twinned structures (HTS). For the same grain size d and the same spacing of primary twins λ1, the average flow stress first increases as the spacing of secondary twins λ2 decreases, reaching a maximum at a critical λ2, and then decreases as λ2 becomes even smaller. The smaller the spacing for λ1, the smaller the critical spacing for λ2. There exists a transition in dominating deformation mechanisms, occurring at a critical spacing of λ2 for which strength is maximized. Above the critical spacing of λ2, the deformation mechanisms are dominated by the two Hall-Petch type strengthening mechanisms: (a) partial dislocations emitted from grain boundaries (GBs) travel across other GBs and twin boundaries (TBs); (b) partial dislocations emitted from TBs travel across other TBs. Below the critical spacing of λ2, the deformation mechanism is dominated by the two softening mechanisms: (a) Partial dislocations emitted from boundaries of the primary twins travel parallel to the TBs of the secondary twins, leading to detwinning of the secondary twins; (b) Boundaries of the primary twins shift entirely, leading to thickening in one part of primary twins and thinning in the other part of primary twins. The present results should provide insights to design the microstructures for reinforcing the mechanical properties in the NT metals with HTS. |
| 学科主题 | 损伤、破坏机理和微结构演化 |
| 分类号 | 二类/Q2 |
| 收录类别 | SCI ; EI |
| 资助信息 | National Key Basic Research Program of China [2012CB932203, 2012CB937500]; NSFC [11002151, 11222224, 11072243, 11021262] |
| 原文出处 | http://dx.doi.org/10.1063/1.4808096 |
| 语种 | 英语 |
| WOS记录号 | WOS:000320132100028 |
| 公开日期 | 2013-06-14 |
| 源URL | [http://dspace.imech.ac.cn/handle/311007/47292]  |
| 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 | Yuan FP,Wu XL. Size effects of primary/secondary twins on the atomistic deformation mechanisms in hierarchically nanotwinned metals[J]. JOURNAL OF APPLIED PHYSICS,2013,113(20):203516/1-203516/6. |
| APA | Yuan FP,&Wu XL.(2013).Size effects of primary/secondary twins on the atomistic deformation mechanisms in hierarchically nanotwinned metals.JOURNAL OF APPLIED PHYSICS,113(20),203516/1-203516/6. |
| MLA | Yuan FP,et al."Size effects of primary/secondary twins on the atomistic deformation mechanisms in hierarchically nanotwinned metals".JOURNAL OF APPLIED PHYSICS 113.20(2013):203516/1-203516/6. |
入库方式： OAI收割
来源：力学研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。