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通过正交试验设计,研究了Cd、Sb、RE复合加入对AZ31镁合金铸态组织和力学性能的影响。Cd、Sb、RE复合加入后,AZ31镁合金铸态组织由富Al的α-Mg基体和均匀、弥散分布的析出相β-Mg17Al12、CeSb及Al11Ce3组成,Cd固溶于基体不形成新相。通过分析,得出对综合力学性能影响最优的试验方案是:Cd含量0.7%,Sb含量0.3%,RE含量0.3%;与AZ31相比,抗拉强度、伸长率、布氏硬度分别提高了22.9%、17.6%、5.9%。
Through the orthogonal experimental design, the effect of Cd, Sb and RE compounding on the as-cast microstructure and mechanical properties of AZ31 magnesium alloy was studied. After the addition of Cd, Sb and RE, the as-cast microstructure of AZ31 magnesium alloy consists of Al-rich α-Mg matrix and uniform and dispersed precipitates β-Mg17Al12, CeSb and Al11Ce3. Through the analysis, the experimental scheme that has the best influence on the comprehensive mechanical properties is obtained: 0.7% Cd, 0.3% Sb and 0.3% RE. Compared with AZ31, the tensile strength, 22.9%, 17.6%, 5.9%.