Effect of rare earth and silicium elements on microstructure of AZ31 magnesium alloy

摘要

The effect of misch metal and silicium additions to AZ31 magnesium alloy on the microstructure was investigated in this study. The results showed that needle shape Al_(11)RE_3 phase and polygonal type Mg_2Si phase formed when misch metal and silicium were added to AZ31 magnesium alloy, which providing refined microstructure compared to AZ_(31) magnesium alloy. The coarse Chinese script type Mg_2Si phase is not found. In addition, the β-Mg_(17)Al_(12) phase completely divorced and formed many white particle phase. Based on the present experiment, the optimal additions of RE and Si were 0.5 wt% and 0.4 wt%, respectively.