High-speed deformation behaviour of 45° extruded magnesium alloy under quasi-in-situ conditions

In this study, quasi-in-situ electron backscatter diffraction was employed to investigate the microstructural evolution and deformation behaviour of ZK60 magnesium alloy with an initial 45 degrees extruded state orientation under two high-speed impacts. The experimental results demonstrated that the deformation of the alloy mainly depended on slip and { 10 1 <overline> 2 } tension twinning. With the increase of deformation, the { 10 1 <overline> 2 } tension twins nucleated continuously, and there were stretching twin variants that were 60 degrees away from the original stretching twins. In addition, compared with the conventional orientation (extrusion direction), 45 degrees samples were easier to activate various slips under high-strain rate deformation conditions, especially < c + a > slips.