Relationship between structure, texture and mechanical properties of pure magnesium after various deformation treatments

The effect of structure and texture formed during various deformation treatments on the mechanical properties of pure magnesium was studied. It is shown that the strength and ductility of pure magnesium depend not only on the grain size, but also on the texture. Thus, equal-channel angular pressing (ECAP), which causes the formation of a sharp inclined basal texture, leads to a strong softening of pure magnesium relative to the extruded state preceding ECAP with a significant increase in ductility. In the case of rotational forging (RF), magnesium has the highest strength after deformation at 350 °C, which causes strong grain refinement and formation of a texture with the highest proportion of the textureless component. Subsequent decrease in the RF temperature and increase in the degree of deformation, leading to further grain refinement and a decrease in the proportion of the textureless component, reduce the conditional yield strength of pure magnesium with a significant increase in ductility. The best combination of mechanical properties - (high strength (σ0.2 = 148 ± 1 MPa, σв = 218 ± 3 MPa) and ductility (δ = 19.0 ± 0.6%) - is achieved after RF at 300 °C and a true degree of deformation ε = 2.77 due to the favorable structure and texture.