变质处理对Mg-8Zn-4Al-0.3Mn合金显微组织和力学性能的影响  

Effects of Al5TiB and RE on Microstructure and Tensile Properties of Mg-8Zn-4Al-0.3Mn Magnesium Alloys

作　　者：李立明[1] 黄晓荣[1] 李富波[1] 

机构地区：[1]郑州电力高等专科学校机电工程系,河南郑州450004

出　　处：《机械传动》2008年第5期91-92,共2页Journal of Mechanical Transmission

基　　金：河南省创新人才工程和河南省杰出青年基金

摘　　要：研究了Al5TiB、RE对Mg-8Zn-4Al-0.3Mn铸造镁合金显微组织和力学性能的影响。结果表明,Mg-8Zn-4Al-0.3Mn铸造镁合金的显微组织主要由Mg相、(Al2Mg5Zn2)相和τ(Mg32(Al,Zn)49)相组成。加入Al5TiB、RE变质剂,合金晶界上三元相的形态由半连续网状改变为颗粒状,三元相的分布逐渐变得弥散而均匀,且可以显著细化合金的铸态组织,晶粒大小由120μm-130μm减少到30μm-50μm。随着Al5TiB、RE变质剂的加入,合金的常温及高温力学性能也有明显的提高。The effects of Al5TiB and RE on microstructure and tensile properties of Mg-8Zn-4Al-0.3Mn casting magnesium alloys are studied.The results show that casting microstructures of Mg-8Zn-4Al-0.3Mn magnesium alloys mainly contain Mg matrix,eutectic α(Mg),φ(Al2Mg5Zn2)phase and τ(Mg32(Al,Zn)49) phase.The morphology of ternary phases on the grain boundaries changes from quasi-continuous net to particle and the distribution of ternary phases gradually change depressively and homogeneously by addition of Al5TiB and RE.Casting microstructures of Mg-8Zn-4Al-0.3Mn magnesium alloys can be refined by addition of Al5TiB and RE,and the size of grains decreases from 120～130μm to 30～50μm.The tensile properties of the alloys at both ambient and elevated temperature are improved significantly by addition of Al5TiB and RE.

关 键 词：镁合金 AL5TIB RE显微组织 力学性能 

分 类 号：TG146.22[一般工业技术—材料科学与工程]