STUDY ON THE HOT DEFORMATION BEHAVIORS OF Al-Zn-Mg-Cu-Cr ALUMINUM ALLOY

<正>The hot deformation behaviors and microstructures of Al-Zn-Mg-Cu-Cr aluminum alloy have been studied using thermal simulation test,optical microscopy and trans- mission electron microscopy.As a result,the true stress versus true strain curves and the microstructures under various deformation conditions are obtained.The microstructures gradually incline to dynamic-recrystallization with the deformation temperature rising and the recrystallization grains refine with the decrease of defor- mation temperature or with raising the strain rates.The quantitative relationship between the Zener-Hollomon parameter (Z) and average recrystallization grain size in the subsequent heat treatment is set up.