The hot deformation behavior of 6013 Al-alloy at530～575℃ and strain rate of 0.001～0.1 s-1 was studied by hot compression simulation test.Based on the electron backscatter diffraction technique,the microstructure evolution and dynamic softening mechanism were discussed,while the so called Ze-ner-Hollomon(Z)parameter was adopted to represent the combined effect of deformation temperature and strain rate.The results show that the flow stress of the alloy increases with the increase of In Z,and the deformation activation energy of the alloy under steady state condition is 217.3 kJ/mol.With the in-crease of lnZ,the recrystallization area fraction and sub-grain size tend to decrease linearly.For 23.91 ≤lnZ＜29.55,dynamic recrystallization is the main softening mechanism,in which geometric dynamic re-crystallization is dominant.For 29.55＜lnZ≤30.24,dynamic recovery is the main softening mechanism.
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