Dynamic Recrystallization and its Effect on Microstructure and Texture Evolution in Magnesium Alloys

In this review, an exploration of the current understanding of dynamic recrystallization (DRX) behavior 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 of anisotropy in stacking fault energy (SFE) in pure Mg and its effect on DRX mechanism. The dislocation slip activities on the low 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. This shift in the crystallographic orientation during DRX is controlled by plastic power. The texture of the DRX grains shifts to φ(2) = 30° position corresponding to the minimum plastic energy in the Euler space. Finally, the process of microstructural evolution and development of necklace structure during CDRR of a single-phase mg alloy AM30 could be elucidated.