A molecular dynamics study of intercrystalline crack propagation in nano-nickel bicrystal films with (010) twist boundary
YQ Zhang and SY Jiang and XM Zhu and YN Zhao, ENGINEERING FRACTURE MECHANICS, 168, 147-159 (2016).
Molecular dynamics simulation was performed to investigate influence of (0 1 0) twist boundary on intercrystalline crack propagation of nano- nickel bicrystal films. The plasticity of nano-nickel bicrystal films decreases with increasing twist angle. Crack arrest in the bicrystal film with twist angle of 0 is attributed to the occurrence of plastic deformation in the whole bicrystal film and hence stress concentration at the crack tip is released. However, new crack initiation in bicrystal films with higher twist angle is attributed to the occurrence of plastic deformation around the grain boundary, where dislocation motion is impeded and thus severe stress concentration is induced. (C) 2016 Elsevier Ltd. All rights reserved.
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