MODELING RECRYSTALLIZATION AFTER HOT DEFORMATION OF ALUMINUM

A physically based model for predicting recrystallization microstructu res and textures after hot deformation of aluminium is presented. The modelling approach taken differs from similar models developed for ste els. The present model is based on recent experimental investigations directed towards identifying the nature of the nucleation sites for re crystallized grains of different crystallographic orientations. Partic le stimulated nucleation, nucleation from cube bands and nucleation fr om grain boundary regions have been incorporated in the model. The mod el has been applied to predictions of recrystallized grain sizes and t extures of a hot deformed AlMgMn alloy and a commercial purity alumini um alloy. The model responds in a correct way to variations in strain, Zener-Hollomon parameter, initial grain size, initial cube fraction a nd precipitation. The good agreement between model predictions and exp erimental results confirms that the recrystallized cube grains are nuc leated from ''old'' cube grains that were present in the starting mate rial and survived the deformation. Copyright (C) 1996 Acta Metallurgic a Inc.