[SY-E2] Symposium E-2

[SY-E2] Investigation of the {10-11} twin boundary migration in Magnesium

Qun Zu¹, Xiao-Zhi Tang², ^○Ya-Fang Guo² (1.School of Mechanical Engineering, Hebei University of Technology, China, 2.Institute of Engineering Mechanics, Beijing Jiaotong University, China)

Due to the low symmetry and limited slip systems, deformation twinning plays an important role in the plastic deformation of hexagonal close-packed (hcp) metals. In this work, the {10-11} twin boundary migration under different directions of shear is studied by molecular dynamics simulations. The twin boundary migration is found to be fulfilled by the two-layer twinning dislocation movement on the twin boundary, with both screw and edge components. The implementation of the TD-mediated migration relies on the <1-210> screw component, while the direction of TB migration is determined by the <10-12> edge component. The two-layer twinning dislocation structure is further compared with the experimental observation.