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Compressive properties, mechanical anisotropy and hardness analysis of Mg-Zn alloy under cross pre-compression

Long Jianyu, Nazeer Faisal, Yang Zhe, Li Chuan

Archives of Civil and Mechanical Engineering

2021

Vol. 21, no. 4

355--367

The Mg–6Zn wt.% (MZ-T6) magnesium (Mg) alloy was fabricated after heat treatment (783 K for 6 h and aging at 453 K for 24 h) of an extruded MZ Mg alloy. Later, the alloy was subjected to cross pre-compression along with different directions and strains and obtained MZ-1 and MZ-2Mg specimens. The MZ-1 was pre-compressed along with ED and then TD, whilst MZ-2 was pre-compressed along with ND and TD. Subsequently, the compressive properties were studied of MZ-T6, MZ-1, and MZ-2 specimens. The result displayed that the cross twinning and lenticular twinning significantly altered the < c > axis orientations from c-axes || normal direction (ND) of MZ-T6 Mg specimen towards c-axes || extruded direction (ED) and transverse direction (TD) in MZ-1 and MZ-2Mg specimens, respectively. The compressive yield strength and ultimate compressive strength were significantly increased along with all loading directions, and mechanical anisotropy was significantly reduced. These results are mainly attributed to twin-induced grain refinement and considerable changes in the texture. The concave down curves changed to sigmoidal curves in pre-compressed Mg specimens along with ND, which is the signature of the twinning and de-twinning phenomenon. While loading along ED and TD exhibited almost similar sigmoidal curves in all specimens, however, the curves displayed different deformation behavior and were evaluated based on strain hardening regimes. The hardness of MZ-1 and MZ-2 specimens was increased ~ 18 and ~ 23%, respectively, compared to the MZ-T6 specimen. Thus, cross pre-compression is a convenient technique to further enhance the applications of Mg alloys for industrial development.