Microstructure, Texture Evolution and Dynamic Recrystallization in Magnesium

Abstract

In this review, an exploration of the current understanding of dynamic recrystallization (DRX) behaviour of Magnesium (Mg) and its alloys has been carried out. The effect of temperature on the recrystallization mechanism is discussed in detail. An important key focus is the issue to anisotropy in stacking fault energy (SFE) in pure Mg and its effect on DRX mechanism. The dislocation slip activities on the low stacking fault energy (SFE) basal plane was responsible for discontinuous dynamic recrystallization (DDRX). Whereas, the dislocation slip activities on the high SFE prismatic/pyramidal planes could led to continuous dynamic recovery and recrystallization (CDRR). It was realized that DDRX leads to the formation of new DRX grains having texture, uncorrelated with the parent-deformed grain. Whereas during CDRR, a rotation of 30° could be observed about {0002} axis from the parent deformed grains. Finally, the process of microstructural evolution and development of necklace structure during CDRR of a single-phase mg alloy AM30 could be elucidated.