2E12铝合金热变形过程中的动态软化机制  

Dynamic Softening Mechanism of 2E12 Aluminum Alloy during Hot Deformation

作　　者：黄裕金[1] 陈志国[1] 

机构地区：[1]中南大学材料科学与工程学院,长沙410083

出　　处：《机械工程材料》2011年第10期22-27,共6页Materials For Mechanical Engineering

基　　金：国家重点基础研究发展规划项目(2005CB623705);国家自然科学基金资助项目(50871123)

摘　　要：用Gleeble-1500型热模拟试验机对2E12铝合金进行了等温热压缩试验,对热变形后的显微组织进行了透射电镜和场发射扫描电镜观察,研究了2E12合金在不同条件下热变形过程中的动态软化机制及其显微组织演化规律。结果表明:在变形温度不高于400℃时,合金的主要动态软化机制为动态回复;而当变形温度不低于450℃时,其主要的动态软化机制为连续动态再结晶,亚晶扭转合并为动态再结晶的主要形核机制,且沿原始晶界优先形核。Isothermal hot compression test of 2E12 aluminum alloy was operated on Gleeble-1500 thermal simulation test machine. Microstructure after hot deformation of the alloy was observed by TEM and FE-SEM. Dynamic softening mechanism and microstructure evolution regular of the alloy during hot deformation under different conditions were studied. The results show that when deformation temperature was below 400℃, the main softening mechanism of the alloy was the dynamic recovery. When deformation temperature was above 450℃, the major softening mechanism was continuous dynamic recrystallization（CDRX）. The major nucleation mechanism of the alloy dynamic recrystallization was subgrain turning merging and alloy nucleated preferentially along original grain boundary.

关 键 词：2E12铝合金 显微组织 动态软化机制 热变形 

分 类 号：TG146.21[一般工业技术—材料科学与工程]