摘要 在挤压铸造条件下，研究了铝含量及固溶时效处理对AM60B合金的组织及力学性能的影响。实验结果表明，材料的抗拉强度随铝含量的增加而提高，屈服强度变化不大，但延伸率急剧下降；固溶时效使γ-Mg₁₇Al₁₂相呈片状存在于原晶界、或呈粒状弥散分布于晶内，抗拉强度得到提高，延伸率得到改善，但合金的屈服强度变化不大。
    关键词 镁合金 挤压铸造 热处理 显微组织 力学性能

Effects of Al Additions and T61 Heat Treatment on the Microstructure and Mechanical Properties of AM Mg Alloy
JIANG Deping,LONG Siyuan,ZHU Zhibing,DING Yutao
(College of Mechanical Engingeering, Chongqing University，Chongqing 400044)

    Abstract Effects of Al additions and T61 heat treatment on the microstructure and mechanical properties of squeeze cast AM magnesium alloy are investigated in the present study. The results indicate that, with the increase of Al concentration, the ultimate tensile strength of AM Mg alloy increases while the elongation decreases dramatically.T61 heat treatment changes the morphology of γ-Mg₁₇Al₁₂ into nodular and short plates at grain boundary and fine particles within the grain, which consequently improves the ultimate strength and elongation, but remains the yielding strength unchanged.
    Key words Mg alloy, squeeze cast, heat treatment, microstructure, mechanical property