Effect of Initial Grain Size on the Dynamic Recrystallization of Hot Deformation for 3003 Aluminum Alloy

The 3003 aluminum alloys with four different initial grain sizes were deformed by isothermal compression in the range of deformation temperature 300–500 °C at strain rate 0.01–10.0 s−1 with Gleeble-1500 thermal simulator. The results show that the smaller the initial grain size of the alloy, the greater the required deformation resistance, and the smaller the peak strain, which is conducive to the occurrence of dynamic recrystallization (DRX). The DRX critical strain increases with the decrease of the deformation temperature or the increase of the strain rate, and the DRX volume fraction increases with the decrease of the strain rate and the increase of the deformation temperature. The average grain size of 3003 aluminum alloy after deformation is smaller than that before deformation. The smaller the initial grain size, the lower the critical recrystallization strain. So the DRX is carried out more fully, contributing to the thermoplastic deformation of the alloy.