Mg-6.3Zn-0.7Zr-0.9Y-0.3Nd合金高温变形行为及热加工图  

High-temperature deformation behavior and processing map of Mg-6.3Zn-0.7Zr-0.9Y-0.3Nd alloy

作　　者：刘欢[1] 王琪[1] 易丹青[1] 王斌[1] 臧冰[1] 

机构地区：[1]中南大学材料科学与工程学院,湖南长沙410083

出　　处：《中南大学学报（自然科学版）》2013年第1期67-74,共8页Journal of Central South University:Science and Technology

基　　金：湖南省科技攻关项目(04GK10082)

摘　　要：采用Gleeble 1500热模拟试验机进行热压缩试验,研究Mg-6.3Zn-0.7Zr-0.9Y-0.3Nd合金在变形温度T=623-773 K、应变速率=0.001-1 s-1时的变形行为,并根据动态材料模型(DMM)建立该合金的热加工图。研究结果表明:该合金在区间1(T=643-703 K,ε=0.001-0.1 s-1)以及区间2(T=703-773 K,ε=0.005-0.1 s-1)变形时,功率耗散效率均大于30%;区域内合金具有典型的动态再结晶组织,因而两区域对应的变形工艺为该合金的最佳热变形工艺;合金热变形的2个流变失稳区分别为:T=623-643 K,ε=0.1-1 s-1;T=703-760 K,ε=0.3-1 s-1。The hot deformation behavior of Mg-6.3Zn-0.7Zr-0.9Y-0.3Nd alloys was investigated by hot compressive tests on Gleeble-1500 thermal simulation test machine at 623-773 K and at the strain rates of 0.001-1 s^-1. The hot processing map was established based on the dynamic material model （DMM）. The results show that the efficiency of power dissipation is above 30% when deformed at interval 1 （T=643-703 K, ε =0.001-0.1 s^-1） and interval 2 （T=703-773 K, ε=0.005-0.1 s^-1）. The typic dynamic recrystallization structure appears in these two areas which are the optional processing parameters of hot deformation. Two instability zones of flow behavior are established as follows： hot temperature of 623-643 K, strain rate of 0.1-1 s^-1 and hot temperature of 703-760 K, strain rate of 0.3-1 s^-1, respectively.

关 键 词：镁合金 高温变形 热加工图 微观组织 动态再结晶 

分 类 号：TG146.2[一般工业技术—材料科学与工程]