Numerical Study of Multiaxial Loading Behavior of Mg Alloy AZ31 Extruded Bar

During plastic forming of magnesium alloy parts, multiaxial deformation state with shear and normal strain components is frequently observed. Therefore, torsional, torsion-tension coupling, and torsion-compression coupling behaviors of AZ31 magnesium alloy extruded bars are numerically investigated. The elastic visco-plastic self-consistent model with the twinning and detwinning scheme, in conjunction with a torsion specific finite element method, is employed. Stress-strain response, twin volume fraction, relative activities of deformation mechanisms, and deformation textures are obtained and used to interpret the multiaxial deformation behaviors of Mg alloys.