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

Effect of Twinning and Dynamic Recrystallization on the High Strain Rate Rolling Process. S.Q.Zhu, H.G.Yan, J.H.Chen, Y.Z.Wu, J.Z.Liu, J.Tian: Scripta Materialia, 2010, 63[10], 985-8