Texture evolution of Magnesium single crystals deformed by High-Pressure Torsion

Single crystals of technical purity Magnesium (99.8 wt.%) of initial orientations [10 (1) over bar2] and [11 (2) over bar2] were subjected to HPT deformation at room temperature up to strains of 10. The microstructural evolution has been analyzed by X-ray microtexture investigations and by in-situ stress-strain measurements. The results can be described in terms of shear arising from HPT deformation and - with higher strains - in terms of recrystallization. In crystals with hard orientation [11 (2) over bar2], these features occur at smaller strains than in crystals with soft orientation [10 (1) over bar2], i.e. with higher symmetry. In general, the observed textures and strength variations are much stronger than those reported for fee HPT deformed metals.