Analysis on behavior of dynamic recrystallization in magnesium alloy AZ31 by orientation mapping

Orientation mapping based on EBSD technique is applied to reveal the orientation features of dynamic recrystallized grains and their neighboring matrix in a magnesium alloy AZ31 with different initial textures. The results show that, irrespective of initial texture and strain amount, new grains are similarly orientated to their neighboring matrix, illustrating a dynamic recrystallization through progressive subgrain rotation. In addition, the new grains gradually rotate to basal orientation in different samples, which indicates an important role of plastic slip during dynamic recrystallization in stead of superplastic deformation. The less subgrain boundaries in deformed grains under heavy strain were observed and these deformed grains have high quality of Kikuchi bands, which indicates that the deformed grains are consumed by the shear stress of grain boundaries parallel to the compression plane, rather than non-basal slip. The misorientation between the new and the deformed grains are measured and discussed in terms of the influence of initial texture.