An experimental study of the mechanical behavior of rolled AZ31B magnesium alloy under combined axial-torsion loading

The mechanical behavior and microstructure at fracture of a rolled AZ31B magnesium alloy were experimentally investigated using tubular specimens subjected to combined axial-torsion loading with different ratios the axial shear stress components. state influences stress-strain responses. equivalent stress-equivalent plastic strain curves under tension-torsion show sigmoidal shape peak value hardening rate increases as ratio increases. Under compression-torsion, concave-down shape, decreases faster rates Among all conditions investigated, pure tension compression result in highest strength, torsion slight has lowest strength. trend ductility is inversely proportional strength respect influence loading. Detailed twinning structures reveal that extensive twins are induced paths. Conversely, combination observed compression-torsion due high Schmid factors resulted from grains favorable orientations. significant effect on post-fracture texture explained terms twin variant favorability which dominated by crystal orientation relative applied principal stresses. experimental results critical for development validation constitutive models alloys multiaxial