Microstructure based modelling of flow behaviour of Al-Mg-Si alloy at different temper conditions.

A new integrated physically based constitutive model was developed for an age hardenable Al-Mg-Si alloy. The kinetics of precipitation during various stages of aging was modelled. The precipitate features consisted of particle radius and volume fraction obtained from the kinetics model, which was used to compute the alloy yield strength/hardness. A published multiinternal variable workhardening model was improved to take into account the effects of solute solution and precipitates on the alloy hardening capacity after performing different cycles of aging treatment. The flow curves and hardness predicted by the model were in good agreement with the experimental results. The model is able to predict the microstructure evolution such as cell/subgrain size and dislocation density in the cell interior during the plastic straining of material at different temper conditions. [ABSTRACT FROM AUTHOR]