Effect of Pyramidal Plane II Twinning in Tensile Deformation on Tensile- Compression Yield Asymmetry in Three Orthogonal Directions of Mg Alloy

XH Zhang and JQ Li and Y Shi and HY Yue and Q Chen, JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE (2023).

DOI: 10.1007/s11665-023-08588-9

Several studies have focused on the tensile-compression yield asymmetry of Mg alloy in only one direction. This study investigated the yield asymmetry in three orthogonal directions through experimental and atomistic simulation approaches. The results indicated no tensile- compression yield asymmetry in all three directions, attributable to the deformation mechanism. The fiber textures of (01 (1) over bar0) < 0001 > and (11 (2) over bar0) < 0001 > formed by extrusion did not absolutely govern the tensile and compression deformation. The results for pyramidal plane II 10 (1) over bar2 twinning in tensile rather than compression further decreased the yield asymmetry. Atomistic simulation results indicated for tensile in the Z-axis (0001 crystal direction), pyramidal plane II 1122 twinning was induced by the atomistic shuffling mechanism. The atomistic simulation results provided new insights into mechanical anisotropy and tensile-compression yield asymmetry.

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