Phenomenological-based constitutive modelling of warm deformation behavior of high-Strength lightweight AL-Li alloy sheets

Abstract

The flow behavior and formability of Al-Li alloys under warm forming conditions are complicated because they depend on several factors, such as the deformation mode, strain, and strain rates. Therefore, characterizing the mechanical response, and deformation behavior of AA2060-T8 sheets under a wide range of temperatures and strain rates is crucial to develop a new thermo-mechanical processing (TMP) route for their wide industrial applications. Furthermore, determining the activation energy (Q) and predicting the flow behaviour of AA2060-T8 sheets under warm forming temperatures is meaningful for characterizing the mechanical response of AA2060-T8 sheets at warm deformation conditions. Thus, in this study, the Arrhenius constitutive model is developed to investigate the influence of strain rate and temperature on the warm deformation behaviour of AA2060-T8 and determine the activation energy (Q) of AA2060-T8, which is a crucial physical parameter to estimate the difficulties of deforming AA2060-T8 sheets under warm forming conditions.

Coupling Computational Homogenization with Crystal Plasticity Modelling for Predicting the Warm Deformation Behaviour of AA2060-T8 Al-Li Alloy

“…Furthermore, they proposed a new computational framework to determine this alloy's flow and anisotropic behaviours at room temperature and several strain rates. After that, they [24] developed an Arrhenius constitutive model to figure out the effect of strain rates and temperatures on the flow behaviour of AA2060 and estimated its activation energy (Q) to reveal the difficulties of forming this alloy under warm forming conditions. Ou et al [25] explained the hot deformation behaviour of AA2060 at different forming conditions, and they realized that dynamic recovery (DRV) is the main reason for softening during hot forming.…”