Microstructure and high-temperature mechanical properties of Mg-6Al magnesium alloy containing yttrium

Effects of adding rare-earth Y in Mg-6Al alloy on its microstructure and high-temperature mechanical properties were investigated.The results show that addition of Y in Mg-6Al alloy dramatically enhances yield strength and tensile strength at 20℃～200℃ for the alloy under aged state.Adding 0.6wt%～2.4wt% Y, the microstructure of the aged Mg-Al alloy is remarkably refined,and dot-like Al_2Y phase with high melting-point forms in the alloy.The optimal microstructure and mechanical properties of the Mg-6Al alloy with 1.2wt% Y are obtained in this study.