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研究了不同稀土La添加量对ZM5合金的铸态显微组织和室温力学性能的影响。结果表明,添加La能够使ZM5合金中的α-Mg晶粒组织细化,并形成稀土化合物Al_(11)La_3和Al_8LaMn_4。随La添加量的增加,沿晶界网状分布的β-Mg_(17)Al_(12)相逐渐转变为弥散分布。其中,La添加量为0.8%时铸态ZM5合金的室温力学性能最好,抗拉强度和伸长率分别为225 MPa和5.32%。
The effects of different rare earth La on the as-cast microstructure and room temperature mechanical properties of ZM5 alloy were studied. The results show that the addition of La can refine the α-Mg grain structure in the ZM5 alloy and form the rare earth compounds Al 11 La 3 and Al 8 LaMn 4. With the addition of La, the β-Mg_ (17) Al_ (12) phase reticulate distributed along the grain boundaries gradually changed into a diffuse distribution. Among them, the best mechanical properties of as-cast ZM5 alloy with 0.8% La addition were 225MPa and 5.32% tensile strength and elongation, respectively.