A study on the hot-deformation behavior and dynamic recrystallization of Al–5 wt.%Mg alloy

A numerical analysis was performed to predict flow curves and the dynamic recrystallization behaviors of an Al–5 wt.%Mg alloy on the basis of results of hot-compression tests. These tests were carried out in the ranges 350–500°C and 0.005–3 s−1 to obtain the Zener–Hollomon parameter Z. The modeling equation for flow stress was a function of strain, strain rate and temperature, and the influence of these variables was quantified using the Zener–Hollomon parameter. In the modeling equation, the effects of strain hardening and dynamic recrystallization were taken into consideration. A model of the evolution of microstructure in the Al–5 wt.%Mg alloy was developed to predict grain size and recrystallized volume fraction during hot working. The microstructure model was combined with a thermo-viscoplastic finite element method (FEM). Model prediction shows a good agreement with microstructures obtained in compression tests.