| Autor: |
Feng, Ya-Xin, Shang, Jia-Xiang, Qin, Sheng-Jian, Lu, Guang-Hong, Chen, Yue |
| Zdroj: |
Physical Chemistry Chemical Physics (PCCP); 7/14/2018, Vol. 20 Issue 26, p17727-17738, 12p |
| Abstrakt: |
Molecular dynamics simulations are performed to investigate the orientation and temperature dependence of tensile response in single crystal W. It is found that W single crystal exhibits distinct temperature-dependent deformation behaviors along different orientations. With increasing temperature, the yield strain in the [001] orientation increases, while those in [110] and [111] orientations first increase and then decrease. The tensile deformations along orientations close to [001] are found to be dominated by twinning; the nucleation and growth of twins are accomplished through the nucleation and glide of ⅙〈111〉 partial dislocations on {112} planes. In contrast, the deformations along orientations close to [110] and [111] are found to be dominated by the slip of ½〈111〉 full dislocations, which move in a stay-and-go fashion. Moreover, intermediate deformation behaviors, which may become unstable at high temperatures, are observed for some intervening orientations. The distinct deformation behaviors of W along different orientations are rationalized based on the twinning–antitwinning asymmetry of ⅙〈111〉 partial dislocations on {112} planes. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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