Influence of Manganese on Deformation Behavior of Magnesium Under Dynamic Loading

Abstract

Magnesium alloys are promising lightweight structural materials. However, their practical utilization requires improvement of strength and ductility. Adding manganese as a solute improves the room-temperature ductility of magnesium alloys by facilitating grain boundary sliding, but its effects on deformation behavior under dynamic loading remain unclear. Accordingly, we investigated the strain rate dependence of both the flow stress and the deformation mechanism of Mg–Mn alloys via tensile tests over a wide range of strain rates. Grain boundary sliding induced relatively larger elongation under quasi-static conditions. On the contrary, the Mg–Mn alloy exhibited limited necking in the high strain rate regime dominated by intergranular fracture.