Effect of twinning and dynamic recrystallization on the high strain rate rolling process

High strain rate rolling (HSRR) was successfully used to produce ultrafine-grained ZK60 magnesium alloy sheets with superior mechanical properties. The achievement of HSRR is attributed to the preferred initiation of twinning and the subsequent dynamic recrystallization (DRX) to inhibit competitive crack initiation. The microstructural homogeneity is improved as the strain rate rises. High strength and ductility of the HSRRed sheet result from the effects of the refined grains and the low dislocation and twinning densities caused by DRX.