Pressure sensitivity of dislocation density in copper single crystals at submicron scale | |
Hu JQ(胡剑桥); Chen Z; Liu ZL; Zhuang Z | |
发表期刊 | MATERIALS RESEARCH EXPRESS |
2018 | |
卷号 | 5期号:1页码:10.1088/2053-1591/aaa0b8 |
ISSN | 2053-1591 |
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 |
DOI | 10.1088/2053-1591/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 | 胡剑桥,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 | 胡剑桥,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. |
条目包含的文件 | 下载所有文件 | |||||
文件名称/大小 | 文献类型 | 版本类型 | 开放类型 | 使用许可 | ||
Jp-2018-017.pdf(3255KB) | 期刊论文 | 出版稿 | 开放获取 | CC BY-NC-SA | 浏览 下载 |
个性服务 |
推荐该条目 |
保存到收藏夹 |
查看访问统计 |
导出为Endnote文件 |
Lanfanshu学术 |
Lanfanshu学术中相似的文章 |
[胡剑桥]的文章 |
[Chen Z]的文章 |
[Liu ZL]的文章 |
百度学术 |
百度学术中相似的文章 |
[胡剑桥]的文章 |
[Chen Z]的文章 |
[Liu ZL]的文章 |
必应学术 |
必应学术中相似的文章 |
[胡剑桥]的文章 |
[Chen Z]的文章 |
[Liu ZL]的文章 |
相关权益政策 |
暂无数据 |
收藏/分享 |
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。
修改评论