Unified constitutive model of aluminum alloy 2219 at elevated temperature

Abstract

Exploring the hot deformation behaviors of materials is essential for the precise numerical simulation of hot forming processes. In this study, the hot tensile deformation behaviors of aluminum alloy 2219-O are studied by uniaxial tensile tests at the temperature range of 473-673K and stain rate range of 0.001-0.1s -1 . Mechanism-based unified constitutive equations are developed to model the grain size, recovery and dislocation density. The results show that under the tested deformation conditions, the flow stress decreases with the increase of deformation temperature or the decrease of strain rate. Additionally, the increasing of elongations to fracture in this study indicates that the elevated temperature can improve the plasticity of AA2219-O. Moreover, the flow stresses predicted by the developed unified constitutive model well agree with the experimental data, which indicate that the developed constitutive model is valid.

Dynamic Softening Mechanism and an Improved Unified Constitutive Model for an Al–Cu–Mn–Fe–Zr Alloy during Warm Deformation

“…Furthermore, Li et al [ 47 ] built a phenomenological constitutive model for a as‐quenched 2219 Al alloy, and found the transformation of strain rate sensitivity from negative to positive when the tensile temperature is raised from 25 to 500 °C. Gan et al [ 48 ] established a physical‐based model for a 2219 Al alloy to discuss the effects of dislocation density, grain size, and dynamic recovery (DRV) on the flow stress.…”