Kinetics of dynamic recrystallization in AA2024 aluminum alloy

Abstract

Understanding the deformation mechanism of aluminum alloys is very important for the transportation and aerospace industries. In the present study, the flow stress-strain curves for AA2024 aluminum alloy were obtained by compressive tests performed on Gleeble-3500 thermo-mechanical machine at temperatures from 250 to 450 °C, strain rates from 0.01 to 10 s-1. The dynamic recrystallization (DRX) kinetics was analyzed and the flow stress model characterizing dynamic recrystallization for AA2024 aluminum alloy was put forward. The flow stress curve at elevated temperature was described as three stages, i.e. hardening, softening and stable stages. The characteristic parameters for dynamic recrystallization in the flow stress model were described as function of Zener-Hollomon parameter. By analyzing the dynamic recrystallization region of flow stress curve, the kinetics of dynamic recrystallization was revealed.