| Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study |
| Du JP; Wang YJ(王云江); Lo YC; Wan L; Ogata S; Wang, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China.
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| 发表期刊 | PHYSICAL REVIEW B
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| 2016
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| 卷号 | 94期号:10页码:104110 |
| ISSN | 2469-9950
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| 摘要 | Accelerated molecular dynamics reveals a mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries (GBs) in Cu. At stress levels up to similar to 90% of the ideal dislocationnucleation stress, atomic shuffling at the E structural unit in a GB acts as a precursor to dislocation nucleation, and eventually a single dislocation is nucleated. At very high stress levels near the ideal dislocation-nucleation stress, a multiple dislocation is collectively nucleated. In these processes, the activation free energy and activation volume depend strongly on temperature. The strain-rate dependence of the critical nucleation stress is studied and the result shows that the mechanism transition from the shuffling-assisted dislocation-nucleation mechanism to the collective dislocation-nucleationmechanism occurs during the strain rate increasing from 10(-4) s(-1) to 10(10) s(-1). |
| DOI | 10.1103/PhysRevB.94.104110
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| URL | 查看原文
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| 收录类别 | SCI
; EI
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| 语种 | 英语
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| WOS记录号 | WOS:000383141100001
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| WOS研究方向 | Physics
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| WOS类目 | Physics, Condensed Matter
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| 项目资助者 | This work was supported by Grants-in-Aid for Scientific Research in Innovative Area (Grant No. 22102003), Scientific Research (A) (Grant No. 23246025), Challenging Exploratory Research (Grant No. 25630013), and the Elements Strategy Initiative for Structural Materials (ESISM). Y.W. acknowledges financial support from the NSFC (Grants No. 11402269 and No. 11672299).
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| 课题组名称 | LNM冲击动力学与新型材料力学性能
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| 论文分区 | 一类
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| 力学所作者排名 | False
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| 引用统计 |
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| 文献类型 | 期刊论文
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| 条目标识符 | http://dspace.imech.ac.cn/handle/311007/59733
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| 专题 | 非线性力学国家重点实验室
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| 通讯作者 | Wang, YJ (reprint author), Chinese Acad Sci, Inst Mech, State Key Lab Nonlinear Mech, Beijing 100190, Peoples R China. |
推荐引用方式
GB/T 7714 |
Du JP,Wang YJ,Lo YC,et al. Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study[J]. PHYSICAL REVIEW B,2016,94,10,:104110.
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| APA |
Du JP,王云江,Lo YC,Wan L,Ogata S,&Wang, YJ .(2016).Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study.PHYSICAL REVIEW B,94(10),104110.
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| MLA |
Du JP,et al."Mechanism transition and strong temperature dependence of dislocation nucleation from grain boundaries: An accelerated molecular dynamics study".PHYSICAL REVIEW B 94.10(2016):104110.
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