The influence of transient deformation conditions on recrystallization during thermomechanical processing of an Al-1% Mg alloy

The recrystallization behaviour of an Al-l% Mg alloy has been investigated following hot deformation under varying strain-rate conditions. Significant differences in recrystallized grain size and recrystallization kinetics ar e observed following a decreasing strain rate, as compared with constant st rain-rate tests. These differences reflect the microstructural transients, which are presented in an accompanying paper. It is shown that the data are reasonably consistent with a physically based internal state variable mode l for recrystallization. A feature of the modelling is the sensitivity anal ysis conducted, which indicates the degree of uncertainty in predicting rec rystallization behaviour, and identifies the critical areas in which experi mental effort should be concentrated. (C) 1999 Acta Metallurgica Inc. Publi shed by Elsevier Science Ltd. All rights reserved.