Author(s): XIE Xi, KANG Guo-zheng, LIU Yu-jie, YU Chao, KAN Qian-hua, School of Mechanics and Engineering, Southwest Jiaotong University
Pages: 160-164
Year: 2014 Issue:  S1
Journal: Applied Mathematics and Mechanics
Keyword:  magnesium alloy; anisotropy; ratcheting effect; dislocation slip; twinning; detwinning;
Abstract: Experimental investigation on tension, compression, strain cycles and stress cycles of the extruded AZ31 magnesium alloy at high temperature were conducted to expose the anisotropic ratcheting evolution and deformation mechanisms of the material. The experimental results show that the magnesium alloy exhibits significant tension-compression asymmetry and cyclic softening characteristics. The ratcheting behavior at high temperature is controlled by the mean stress and stress amplitude, and the ratcheting effect increases with the mean stress and stress amplitude. Besides, 3 types of plastic deformation mechanisms including dislocation slip, twinning and detwinning appear in the cyclic deformation process of the magnesium alloy, which decides that the ratcheting behavior exhibits different evolution characteristics under different loading cases at high temperature.