利用光学金相显微镜OM和XRD分析了分别加入0.1%,0.3%,0.5%,0.7%和1.0%Ce的AZ91D合金显微组织和相组成,测试了室温力学性能和硬度.结果表明,加入一定量Ce后的AZ91D合金形成杆状化合物Al4Ce,被推移到生长界面,阻碍枝晶的自由生长,从而细化合金显微组织;Ce能提高AZ91D合金室温抗拉强度和硬度,而对其屈服强度和延伸率影响不大;加入0.7%Ce的AZ91D合金晶粒细化效果好,其综合力学性能比较理想.
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