Crystal plasticity of Cu nanocrystals during collision

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING

卷:585

Article

Cheng, Bingqing¹  Ngan, Alfonso H. W.¹ 

[1] Univ Hong Kong, Dept Mech Engn, Hong Kong, Hong Kong, Peoples R China

关键词: Nanoparticle;    Plasticity;    Dislocation;    Twinning;    Shear wave;    Cold sintering;   

DOI  :  10.1016/j.msea.2013.07.065

来源: Elsevier

【 摘 要 】

In this work, we simulate the response of two Cu nanoparticles colliding at different approaching rates at room temperature by MD. For small nanospheres, the formation of single twins is favored at high approach rates, whereas larger nanospheres mainly deform by dislocation slip. For small nanocubes with large {100} flat surfaces, however, a dislocation-free direct geometrical conversion process that leads to five-fold twinning dominates except at highly retarded approaching rates. For larger nanocubes, single twin formation is the governing plasticity mechanism. The probability for plastic deformation by dislocation slip or twinning is attributed to the abundance of surface steps, which act as sites for dislocation nucleation. (C) 2013 Elsevier B.V. All rights reserved.

【 授权许可】

Free