High‐Temperature Tensile and Compressive Behavior of Peak‐Aged Sand‐Cast Mg–10Gd–3Y–0.5Zr Alloy

The uniaxial tensile and compressive behavior of the peak‐aged sand‐cast Mg–10Gd–3Y–0.5Zr alloy from 25 to 250 °C is investigated. The results show that the alloy exhibits excellent high‐temperature tensile and compressive properties compared with other magnesium alloys. The tensile yield stress and ultimate tensile strength remain unchanged, while the compressive yield strength slightly increases when testing temperature rises from 25 to 150 °C. This can be attribute to the metastable β′(cbco) phase and the fine ductility of the alloy at high temperature. The alloy shows tension‐compression yield asymmetry which could be associated to the pyramidal slip and extension twinning. In addition, the fracture mechanisms of the tested alloy at different temperatures are studied systematically.