Anisotropic-asymmetric yield behavior of Mg-Gd-Y alloy

This study investigates and characterizes the plastic deformation behavior of the Mg-Gd-Y alloy through mechanical tests conducted under uniaxial tension and compression. Using the digital image correlation technique, experimental data has been collected from various loading directions for the Mg-Gd-Y alloy. The resulting true stress-plastic strain curves are analyzed, revealing that the yield stress and hardening characteristics exhibit significant tension-compression asymmetry and anisotropy. Notably, the stress observed during uniaxial compression exceeds that during uniaxial tension at the same level of plastic strain. To describe the anisotropic and asymmetric yield behavior of the Mg-Gd-Y alloy, the Yoon2014 anisotropic yield function is employed, tracking the evolution of the yield surface. The findings indicate that the tension-compression asymmetry of the Mg-Gd-Y alloy intensifies with increasing plastic deformation.