Hot deformation behavior of homogenized Al–3.2Mg–0.4Er aluminum alloy

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.