Twinning in rolled AZ31B magnesium alloy under free-end torsion

The mechanical response and microstructure evolution in a rolled AZ31B magnesium alloy were experimentally characterized using companion thin-walled tubular specimens under free-end monotonic torsion. made with their axes along the normal direction of plate. shear stress-shear strain shows subtle sigmodal shape that is composed four distinctive stages hardening. Basal slips tension twinning are operated throughout deformation. Both compressing favored. Growth interaction twins multiple variants lead to formation twin-twin boundaries (TTBs). collective hardening effects by twin boundary (TB) TTB result unique rise rate Stage II III. In addition primary twins, tension-compression double tension-compression-tension tertiary detectable sizes observed tension-twin favorable grains whereas compression-tension detected unfavorable grains; all which become more observable increasing strain. During IV deformation where exhausts, non-basal prismatic significant responsible for progressive decrease this stage. Swift effect, commonly textured materials, evidenced origin effect confirmed be dislocation at less than 5% but predominantly due larger plastic