金属型铸造Mg-8Zn-4Al-0.25Mn合金的凝固行为及组织特征  

Solidification Behaviour and Microstructure Characteristic of Permanent Mould Casting Mg-8Zn-4A1-0.25Mn Alloy

作　　者：杨明波[1] 潘复生[2] 白亮[2] 

机构地区：[1]重庆工学院材料科学与工程学院,重庆400050 [2]重庆大学材料科学与工程学院,重庆400030

出　　处：《铸造技术》2007年第9期1198-1200,共3页Foundry Technology

基　　金：重庆市科技攻关项目(编号:CSTC-2004AA4003)

摘　　要：研究了金属型铸造Mg-8Zn-4Al-0.25Mn合金的凝固行为及组织特征。结果表明:合金的铸态组织主要由初生α-Mg、Mg32(Al,Zn)49相和Al2Mg5Zn2相组成,其中Mg32(Al,Zn)49相主要呈连续状和/或半连续状分布,Al2Mg5Zn2相主要呈孤岛状分布。此外,根据DSC结果还确定了合金的凝固温度范围、液相线及固相线温度,并阐明了合金凝固过程中的相变。The solidification behaviour and microstructure characteristic of permanent mould casting Mg-8Zn-4Al-0.25Mn alloy were investigated. The results indicate that the as-cast microstructure of the alloy is composed of primary α-Mg, Mg32 （Al, Zn）49 and Al2Mg5Zn2 phases, and the Mg32 （Al, Zn）49 and Al2Mg5Zn2 phases mainly exhibit continuous and/or quasti-continuous and isolated distribution respectively. In addition, the solidification temperature range, liquidus and solidus temperatures are determined from the DSC results, and the phases transformation during the solidification Drocess are clarified as well.

关 键 词：Mg-8Zn-4Al—0.25Mn合金 凝固行为 组织特征 

分 类 号：TG249.3[金属学及工艺—铸造]