郑勇刚

1130

  • 教授     博士生导师   硕士生导师
  • 主要任职:力学与航空航天学院副院长
  • 其他任职:工程力学系副主任(分管本科生、研究生培养)
  • 性别:男
  • 毕业院校:大连理工大学
  • 学位:博士
  • 所在单位:力学与航空航天学院
  • 学科:工程力学. 计算力学. 生物与纳米力学
  • 办公地点:一号综合实验楼620B房间
  • 电子邮箱:zhengyg@dlut.edu.cn

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开通时间:2016.9.13

最后更新时间:2025.3.31

Roles of grain boundary and dislocations at different deformation stages of nanocrystalline copper under tension

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论文类型:期刊论文

发表时间:2009-01-26

发表刊物:PHYSICS LETTERS A

收录刊物:SCIE

卷号:373

期号:5

页面范围:570-574

ISSN号:0375-9601

关键字:Nanocrystalline copper; Molecular dynamics simulation; Plastic deformation; Dislocation; Grain growth

摘要:The plastic deformation of nanocrystalline copper subjected to tension has been studied using molecular dynamics simulation. The results show that, in the initial stage, the deformation is mainly boundary-mediated in small grains; while in the late stage, the deformation is accommodated by dislocations in large grains. It is also found that the stress-assisted grain growth occurs owing to atomic diffusion and grain boundary migration. These results are consistent with recent experimental observations. (c) 2008 Elsevier B.V. All rights reserved.