Study of Mg-Al-Ca magnesium alloy ameliorated with designed Al8Mn4Gd phase

摘要

To investigate the effect of AlsMn4Gd phase on microstructural and mechanical properties of Mg-Al-Ca magnesium alloy,two Mg-2.5AbCa and Mg-2.5Al2Ca-0.1 Al8Mn4Gd alloys were designed and compared in this work.The results show that a small amount of Gd can significantly refine a-Mg grains and change the morphology of AUCa particles.Indeed,the formed Al8Mn4Gd phase could serve as a heterogeneous nucleation site for the a-Mg grains and AbCa particles.Furthermore,the introduction of Gd not only optimized the mechanical properties of Mg-Al-Ca alloy,but also facilitated the thermal deformation(such as hot rolling).