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Twin and dislocation mechanisms in tensile W single crystal with temperature change: a molecular dynamics study

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Abstract

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.

Graphical abstract: Twin and dislocation mechanisms in tensile W single crystal with temperature change: a molecular dynamics study

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Publication details

The article was received on 22 May 2018, accepted on 31 May 2018 and first published on 01 Jun 2018


Article type: Paper
DOI: 10.1039/C8CP03241F
Citation: Phys. Chem. Chem. Phys., 2018, Advance Article
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    Twin and dislocation mechanisms in tensile W single crystal with temperature change: a molecular dynamics study

    Y. Feng, J. Shang, S. Qin, G. Lu and Y. Chen, Phys. Chem. Chem. Phys., 2018, Advance Article , DOI: 10.1039/C8CP03241F

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