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利用真空电磁感应熔炼炉制备AZ91-XEr(x=0.58%,1.14%,1.81%)镁合金,采用光学显微镜(OM)、X射线衍射仪(XRD)、扫描电镜(SEM)及能谱分析仪(EDS)等研究了Er对实验合金显微组织的影响。结果表明:添加Er的合金组织得到细化,当Er含量为1.14%时,合金组织细化最好,平均晶粒尺寸约25μm。实验合金主要由基体α-Mg、β(Mg17Al12)和Al2Er相组成,随Er含量增加,组织中的Al2Er相抑制了β相长大,使β相由主要沿晶界呈不连续岛状分布变为细小块状于组织中弥散分布。
The AZ91-XEr (x = 0.58%, 1.14%, 1.81%) magnesium alloy was prepared by vacuum induction furnace. The microstructures of AZ91-XEr alloy were characterized by optical microscope (OM), X-ray diffraction (XRD), scanning electron microscopy (SEM) (EDS) and other Er studied on the experimental microstructure of the microstructure. The results show that the microstructure of the alloy with Er addition is refined. When the content of Er is 1.14%, the microstructure of the alloy is refined with the average grain size of about 25 μm. The experimental alloys mainly consist of α-Mg, β (Mg17Al12) and Al2Er phases. With the increase of Er content, the Al2Er phase in the microstructure inhibits the growth of β phase and the β phase distributes discontinuously along the grain boundaries Small lumps dispersed in the organization.