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Pressure sensitivity of dislocation density in copper single crystals at submicron scale
Hu JQ(胡剑桥); Chen Z; Liu ZL; Zhuang Z
2018
发表期刊MATERIALS RESEARCH EXPRESS
卷号5期号:1页码:10.1088/2053-1591/aaa0b8
ISSN2053-1591
摘要

It is known that the mechanical responses of metallic samples are insensitive to confining pressure at macroscale. As a result, von Mises elastoplasticity has been commonly used to model metals in engineering practice. With the use of discrete dislocation dynamics in this study, we explore the dislocation behavior of finite-sized copper single crystals of different sizes under uniaxial compression and hydrostatic pressure, respectively. It is found that the dislocation density approaches a stable value with the increase of hydrostatic pressure while it still keeps increasing under uniaxial compression as the size-dependent yield stress is reached. This difference is also dependent on the loading rate. The yield stress under uniaxial compression exhibits the conventional loading rate effect, while the stable value of dislocation density under hydrostatic compression increases with the increase of loading rate. Moreover, a transition from being pressure-insensitive to pressure-sensitive on the evolution of dislocation density is observed under hydrostatic compression as the sample size becomes small. These findings provide useful insights into the elastoplastic responses of metallic samples at microscale.

关键词Dislocation Evolution Hydrostatic Pressure Discrete Dislocation Dynamics
DOI10.1088/2053-1591/aaa0b8
收录类别SCI ; EI
语种英语
WOS记录号WOS:000419330200004
关键词[WOS]Numerical Investigations ; Deformation Mechanisms ; Plastic-deformation ; Micropillars ; Nanopillars ; Nucleation
WOS研究方向Materials Science
WOS类目Materials Science, Multidisciplinary
项目资助者National Natural Science Foundation of China(11132006 ; 11302115 ; 11232003)
论文分区Q3
力学所作者排名1
引用统计
文献类型期刊论文
条目标识符http://dspace.imech.ac.cn/handle/311007/72253
专题非线性力学国家重点实验室
推荐引用方式
GB/T 7714
Hu JQ,Chen Z,Liu ZL,et al. Pressure sensitivity of dislocation density in copper single crystals at submicron scale[J]. MATERIALS RESEARCH EXPRESS,2018,5(1):10.1088/2053-1591/aaa0b8.
APA Hu JQ,Chen Z,Liu ZL,&Zhuang Z.(2018).Pressure sensitivity of dislocation density in copper single crystals at submicron scale.MATERIALS RESEARCH EXPRESS,5(1),10.1088/2053-1591/aaa0b8.
MLA Hu JQ,et al."Pressure sensitivity of dislocation density in copper single crystals at submicron scale".MATERIALS RESEARCH EXPRESS 5.1(2018):10.1088/2053-1591/aaa0b8.
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