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中文摘要：
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（0M）、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A12Er相组成，随Er含量增加，组织中的A12Er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。
英文摘要：
AZ91-XEr （x =0.58% .1.14% .1.81% ）alloys were prepared by vacuum induction melting process. The microstructure of the samples with different Er contents was investigated by optical microscope（OM）, X-ray diffraction（XRD）, scanning electron microscope （SEM）, energy diffraction spectrum （EDS）. The results show that with the addition of Er, the microstructure of the alloy is refined. When Er content is 1.14%, the grains of the alloy are the finest, and the average grain size is about 25μm. The alloy is mainly composed of α-Mg matrix, β（Mg17TAl12） and A12Er phase.With the increase of Er content, A12Er phase holds up the growth of β （Mg17TA112） phase, which is mainly along the grain boundaries transition from the discontinuous island into small, dispersed block distribution.
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