Atomistic deformation mechanisms in twinned copper nanospheres

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• 作者：Jianjun Bian (11)
  Xinrui Niu (12)
  Hao Zhang (13)
  Gangfeng Wang (11)
  
  11. Department of Engineering Mechanics ; SVL ; Xi鈥檃n Jiaotong University ; Xi鈥檃n ; 710049 ; China
  12. Department of Mechanical and Biomedical Engineering ; City University of Hong Kong ; 83 Tat Chee Ave ; Kowloon ; Hong Kong ; China
  13. Department of Chemical and Materials Engineering ; University of Alberta ; Edmonton ; AB ; T6G 2V4 ; Canada
  
• 关键词：Nanosphere ; Twin boundary ; Strengthening
• 刊名：Nanoscale Research Letters
• 出版年：2014
• 出版时间：December 2014
• 年：2014
• 卷：9
• 期：1
• 全文大小：1,395 KB
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• 刊物主题：Nanotechnology; Nanotechnology and Microengineering; Nanoscale Science and Technology; Nanochemistry; Molecular Medicine;
• 出版者：Springer US
• ISSN：1556-276X

文摘

In the present study, we perform molecular dynamic simulations to investigate the compression response and atomistic deformation mechanisms of twinned nanospheres. The relationship between load and compression depth is calculated for various twin spacing and loading directions. Then, the overall elastic properties and the underlying plastic deformation mechanisms are illuminated. Twin boundaries (TBs) act as obstacles to dislocation motion and lead to strengthening. As the loading direction varies, the plastic deformation transfers from dislocations intersecting with TBs, slipping parallel to TBs, and then to being restrained by TBs. The strengthening of TBs depends strongly on the twin spacing.