利用分子动力学研究梯度纳米孪晶Cu的微观变形机理*
周昊飞, 男, 1986年生, 博士
收稿日期: 2013-09-09
修回日期: 2013-09-09
网络出版日期: 2014-02-20
基金资助
* 国家自然科学基金项目11172264和11222218及浙江省重点科技创新团队计划项目2009R50010资助
INVESTIGATION OF ATOMISTIC DEFORMATION MECHANISM OF GRADIENT NANOTWINNED COPPER USING MOLECULAR DYNAMICS SIMULATION METHOD
Received date: 2013-09-09
Revised date: 2013-09-09
Online published: 2014-02-20
Supported by
Supported by National Natural Science Foundation of China (Nos.11172264 and 11222218) and Science and Technology Innovative Research Team of Zhejiang Province (No.2009R50010)
周昊飞 , 曲绍兴 . 利用分子动力学研究梯度纳米孪晶Cu的微观变形机理*[J]. 金属学报, 2014 , 50(2) : 226 -230 . DOI: 10.3724/SP.J.1037.2013.00570
Strengthening by twin boundaries at nanoscale and gradient surface nanocrystallization are two important strengthening approaches recently drawing considerable attention in the field of metallic material research. In the present work, a novel nanostructure, i.e., gradient nanoscale twin boundaries, is proposed. To reveal their unique deformation mechanism, uniaxial tension simulations of gradient nanotwinned copper are investigated by molecular dynamics simulations. The results show that partial dislocations govern the deformation of relatively thicker twins while full dislocations control the deformation of relatively thinner twin layers. Nanoindentation processes of gradient nanotwinned copper are also performed, providing insights on the strengthening and hardening effects of nanoscale twin boundaries.
Key words： molecular dynamics; nanoscale twin boundary; dislocation; strength
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