Dynamic recrystallization of Mg and Mg–Y alloys: Crystallographic texture development

Abstract

Pure magnesium and three binary Mg–Y alloys (0.23, 0.84 and 2.71 wt%Y) have been deformed in plane strain compression under conditions where dynamic recrystallization (DRX) is observed. The development of crystallographic texture during deformation has been determined for both the parent and DRX grains. In all but the highest Y alloy, the texture of the DRX grains was found to follow that of the parent grains closely in all alloys, implying that the DRX texture is dominated by the deformation conditions, rather than preferred nucleation or growth. In the highest Y alloy, the DRX texture is randomized, which also suggests that preferred nucleation or growth is not responsible for texture formation in this alloy. A transition in macrotexture development was observed in going from pure Mg deformed at 250 °C, to Mg–2.71 wt%Y deformed at 450 °C. This can be attributed to activation of additional slip modes, and a concomitant decrease in the contribution of twinning to deformation.