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.
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