Mg-5Zn-2Er-1.5Nd-xCa镁合金的显微组织和力学性能  

Microstructure and Mechanical Properties of Mg-5Zn-2Er-1.5Nd-xCa Alloy

作　　者：周天承[1] 张强[1] 李超[1] 

机构地区：[1]芜湖职业技术学院轻化系,安徽芜湖241006

出　　处：《芜湖职业技术学院学报》2011年第1期1-4,共4页Journal of Wuhu Institute of Technology

基　　金：2011年度安徽省高校省级自然科学研究项目KJ2011B220系列成果之一

摘　　要：利用光学显微镜、扫描电镜及其附带的能谱仪和电子万能试验机,研究了Mg-5Zn-2Er-1.5Nd-xCa(0.4<x<2.5)镁合金的显微组织和力学性能。结果表明:随着合金中钙含量的逐渐增多,其晶粒尺寸逐渐减小至25μm左右,沿晶界处的析出相和晶内呈弥散分布的析出相颗粒也逐渐增多,它们的成分也大致相同。合金在室温和175℃时的抗拉强度和伸长率均逐渐增大,当钙含量为1.9%时均达到最大值。合金强度明显高于Mg-5Zn-2Er(超声波辅助铸造)和ZK60合金,仅次于Mg-5Zn-2.1Er-1.5Nd-0.5Zr合金,尤其是其具有突出的高温力学性能。By using optical microscopy,scanning electron microscope and incidental EDS and electronic universal testing machine,the microstructure and mechanical properties of Mg-5Zn-2Er-1.5Nd-xCa（0.4x2.5） magnesium alloy is studied.The results show that,with the increase of the Ca content in the alloy,its grain size reaches the minimum of about 25μm,the precipitation along the grain boundary and the precipitation particles uniformly dispersed in the grain gradually increase,their component are also about the same.Meanwhile,the tensile strength of the alloy at room temperature and at 175℃ increases gradually,and they all reach the maximum when the Ca content is 1.9%.Its strength is obviously higher than Mg-5Zn-2Er（ultrasonic auxiliary casting） and ZK60 alloy,inferior to Mg-5Zn-2.1Er-1.5Nd-0.5Zr alloy,especially with prominent mechanical properties under high-temperature.

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]