Cyclic torsion of AZ31 magnesium alloy rod and its effect on mechanical property

• Published in: Cai liao gong cheng = Journal of materials engineering Vol. 47; no. 9; pp. 46 - 54
• Main Authors: Song, Guang-sheng, Ji, Kai-sheng, Zhang, Shi-hong
• Format: Journal Article
• Language: Chinese
• Published: Beijing Beijing Institute of Aeronautical Materials 01.09.2019; Journal of Materials Engineering
• Subjects: Compression tests; Compressive strength; Control rods; Crack propagation; cyclic torsion; Extrusion; Grains; Hysteresis; magnesium alloy rod; Magnesium alloys; Magnesium base alloys; Mechanical properties; mechanical property; Microcracks; Stress propagation; Texture; Torsion; Twinning; Work hardening
• ISSN: 1001-4381; 1001-4381
• DOI: 10.11868/j.issn.1001-4381.2019.000043

The cyclic torsion was carried out on the extruded AZ31 magnesium alloy rods at room temperature by using a computer controlled torsion testing machine. The texture of initial extruded magnesium alloy rods was measured by the XRD technique, which displays a typical basal texture. The mechanical properties during deformation were measured, and the microstructure and texture feature after torsion were analyzed by the EBSD. Meanwhile, the effect of cyclic torsion on mechanical properties of magnesium alloy rods was also investigated. The results show that the symmetrical stress-strain hysteresis curves are obtained during the cyclic torsion of magnesium alloy rods, revealing that sliding is the dominant deformation mode during former torsions, moreover, the stress peak values of the hysteresis curves present an increasing first and then decreasing trend with the increase of cycle period, which is dominated by work hardening and internal micro-crack propagation. The stress peak forms at the 4th cycle under condit