Relationship between the Structure, Texture, and Mechanical Properties of Pure Magnesium after Deformation Treatment under Different Conditions

Abstract—The influence of the structure and texture formed by deformation treatment under different conditions on the mechanical properties of pure magnesium is investigated. The strength and plasticity of pure magnesium is shown to depend not only on grain size, but also on texture. For example, equal-channel angular pressing (ECAP), which causes a sharp inclined basal texture, leads to significant softening of pure magnesium as compared to the pre-ECAP extruded state at a significant increase in plasticity. In the case of rotary swaging (RS), magnesium has the highest strength after deformation at 350°C, which brings about strong grain refinement and a texture with the highest fraction of a nonbasal component. A further decrease in the RS temperature and an increase in the strain, which leads to further grain refinement and a decrease in the fraction of a texture-free component, decrease the yield strength of pure magnesium at a significant increase in its plasticity. The best combination of mechanical properties, specifically, a high strength (σ0.2 = 148 ± 1 MPa, σu = 218 ± 3 MPa) and plasticity (δ = 19.0 ± 0.6%), is achieved after RS at 300°C and a true strain ε = 2.77 due to the formation of a favorable structure and texture.