Abstract:The hot deformation behavior of the homogenized Al-3.2Mg-0.4Er aluminum alloy was investigated at 573-723 K under strain rates of 0.001-1 s^-1. On the basis of compression experimental results, an accurate phenomenological constitutive equation that coupled the effects of strain rate, deformation temperature and strain was modeled. Furthermore, a kinetic model of dynamic recrystallization and processing map were also presented. The results show that the flow stress of the studied Al-3.2Mg-0.4Er alloy can be predicted accurately using the proposed constitutive model. The evolution of microstructure and the volume fraction of dynamic recrystallization can be described exactly in terms of S-curves with the proposed kinetic model. Moreover, the processing maps for hot working at different strains were constructed, suggesting the optimum processing conditions for this alloy are 573 K, 0.001 s^-1 and 723 K, 0.001-0.1 s^-1.

Key words: Al-Mg alloy; hot deformation; constitutive model; processing map