热处理工艺对Mg-8Zn-4Al-0·25Mn镁合金组织和性能的影响  

Effects of Heat Treatment on Microstructure and Properties of Mg-8Zn-4Al-0.25Mn Magnesium Alloy

作　　者：杨明波[1] 潘复生[2] 白亮[2] 汤爱涛[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：《金属热处理》2007年第10期62-65,共4页Heat Treatment of Metals

基　　金：重庆市科技攻关项目(CSTC-2004AA4003)

摘　　要：研究固溶和时效处理对Mg-8Zn-4A l-0.25Mn合金组织和性能的影响。结果表明,试验合金经345℃固溶12 h水冷后,合金组织中的Mg32(A l,Zn)49和A l2Mg5Zn2相三元化合物数量急剧减小,并且原有连续网状Mg32(A l,Zn)49相变为断续网状,颗粒状Mg32(A l,Zn)49相和小块状A l2Mg5Zn2相变得更加圆整和细小。同时,合金的显微硬度随固溶时间增加而逐渐降低。经180℃时效处理后,析出大量弥散分布的细小Mg-Zn-A l三元颗粒状析出物,并且随着时效时间延长,合金的显微硬度逐渐增加,在12 h时达到最大值。The effects of solution and aging treatment on microstructure and properties of Mg-8Zn-4Al-0. 25 Mn alloy were investigated. The results indicate that after solid solution treatment at 345 ℃ for 12 h and followed by water cooling,the amount of Mg32 （Al,Zn）49 and Al2Mg5Zn2 phases in the experimental alloy decrease greatly, and the morphology of these phases become disconnected and spherodized. With the increase of solution time, the microhardness of the alloy decreases gradually. In addltion,when the alloy aged at 180 ℃ ,lots of tenary Mg-Zn-Al precipitation phases with dispersed morphology are found, and with the aging time increasing,the microhardness of the alloy increases and the maximum micro- hardness is obtained when aged for 12 h.

关 键 词：Mg-8Zn-4Al-0.25Mn合金 热处理 组织与性能 

分 类 号：TG146.1[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]