稀土Er对AZ91镁合金铸态组织的影响  

Effect of Er Addition on Microstructure of AZ91 Alloy

作　　者：崔晓明[1] 白朴存[1] 董小倩[1] 侯小虎[1] 刘威[1] 

机构地区：[1]内蒙古工业大学材料科学与工程学院,内蒙古呼和浩特010051

出　　处：《热加工工艺》2014年第20期34-36,共3页Hot Working Technology

基　　金：教育部春晖计划项目(2011061);内蒙古自治区自然科学基金项目(2013MS0801)

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(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。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.

关 键 词：ER AZ91镁合金 显微组织 

分 类 号：TG146.2[一般工业技术—材料科学与工程]