Mg-5Zn-xEr-1.5Nd-0.5Zr(1.1

Microstructure and Mechanical Properties of Mg-5Zn-xEr-1.5Nd-0.5Zr (1.1 < x < 2.8) Magnesium Alloy

作　　者：周天承[1] 张强[1] 吴为亚[1] 

机构地区：[1]芜湖职业技术学院,芜湖241001

出　　处：《机械工程材料》2011年第4期91-94,共4页Materials For Mechanical Engineering

基　　金：芜湖市科技计划项目(芜科计字2009-190-16);2011年度安徽高校省级自然科学研究项目(KJ2011B220)

摘　　要：采用光学显微镜、扫描电镜及其附带的能谱仪和电子万能试验机等研究了Mg-5Zn-xEr-1.5Nd-0.5Zr(1.1<x<2.8)镁合金的显微组织和力学性能。结果表明:随着合金中铒含量的逐渐增多,其晶粒尺寸逐渐减小至25μm左右,合金沿晶界处的析出相也逐渐增多,并且在晶内均析出了呈弥散分布的析出相颗粒;合金的室温和175℃时抗拉强度均先增后降,当铒质量分数为2.1%时均达到最大值,分别为269,174 MPa;该合金在175℃下的断裂主要为穿晶断裂和沿晶断裂的混合型断裂。By using optical microscopy, scanning electron microscopy and its incidental EDS and electronic universal testing machine, microstructure and mechanical properties of the Mg-SZn-xEr-1. 5Nd-0. 5Zr （1. 1〈x〈 2.8） magnesium alloy were studied. The results show that with the increase of Er content in the alloy, its grain size reached the minimum of abom 25μm, the precipitates along the grain boundaries gradually increased and the unifornlly dispersed particles were precipitated from the grains. The tensile strength of the alloy at room temperature and 175 C increased first and then decreased gradually, and the maximum of 269, 174 MPa could be obtained when the Er content was 2. 1wt%. The fracture of the alloy at 175℃ mainly belonged to the mixture of intragranular fracture and intergranular fracture.

关 键 词：镁合金 显微组织 力学性能 稀土 时效处理 

分 类 号：TG146.22[一般工业技术—材料科学与工程]