期刊
COMPUTATIONAL MATERIALS SCIENCE
卷 81, 期 -, 页码 226-232出版社
ELSEVIER
DOI: 10.1016/j.commatsci.2013.08.026
关键词
Nanoindentation; Molecular dynamics; Dislocation; Copper
资金
- Fundamental Research Funds for the Central Universities [xjj2010082, xjj2013111]
- Natural Science Foundation of Shaanxi Province of China [2012JM1007]
- Programs Foundation of Ministry of Education of China
The incipient plastic deformation of single-crystal copper thin film with in-plane residual stress under Hertzian nanoindentation is studied using molecular dynamics simulation. The result reveals that the residual stresses significantly influence the surface strength and dislocation nucleation behavior of material: (i) the indentation hardness decreases with tensile residual stress, while it increases with moderate compressive residual stress, but it may drop down under higher compressive residual stress; (ii) the dislocation nucleation depth and its slip direction also vary with different residual stress state. This demonstrates that residual stress may influence incipient plasticity not only on the threshold value but also on the initial dislocation nucleation behavior under indentation. (C) 2013 Elsevier B.V. All rights reserved.
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