Effect of TiB2-doping on the microstructure and mechanical properties of Mg-Zn-Y-Mn alloy

Abstract The effect of TiB 2 doping on the microstructure and mechanical properties of the Mg 94.4 Zn 2.5 Y 2.5 Mn 0.6 alloy was investigated in this study, which shown that the volume fraction of long-period stacking ordered (LPSO) structures was significantly increased and the LPSO/W interface shown anisotropy with TiB 2 doping to the Mg 94.4 Zn 2.5 Y 2.5 Mn 0.6 alloy. When the doping amount of TiB 2 was 0.006 wt%, the Mg 94.4 Zn 2.5 Y 2.5 Mn 0.6 alloy appeared uniform equiaxed dendrites and the volume fraction of the LPSO phase was 3.65 times higher than of the TiB 2 -free alloy. Meanwhile, Mg 94.4 Zn 2.5 Y 2.5 Mn 0.6 alloy with 0.006 wt% TiB 2 -doping shown optimal mechanical performance with ultimate tensile strength and elongation of 240 MPa and 13.5%, respectively.