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Vertex dynamics simulations of subgrain growth in Al-Mn binary alloys : Effect of crystallographic orientation

Abstract : The present study aims to investigate the effect of crystallographic orientation on the kinetics of recovery in deformed samples of the Al-0.1%Mn binary alloy using vertex dynamics simulations of subgrain growth. In order to estimate the recovery kinetics experimentally, a polycrystalline bar of the alloy was cold rolled and samples extracted from the rolled bar were subjected to isothermal annealing at four temperatures for different durations. The activation energy for recovery was estimated using microhardness measurements and the recovery kinetics model developed by Vandermeer et al. Several practical difficulties were encountered when using this model due to the complexity of the model equations and the amplification of experimental uncertainty by exponential functions in the model. The activation energy found was therefore not reliable. Using the material properties mentioned in the literature, vertex dynamics simulations of subgrain growth were carried out. Deformation microstructures of monocrystals having Brass and Goss orientations were reproduced in the simulations. Good agreement was achieved with the experimental results of Albou et al. The low speed of recovery in Brass crystals was due to the presence of subgrain boundaries of low disorientations. The Goss deformation microstructure consists of bands with subgrain boundaries of high disorientations. High disorientations lead to high mobilities of subgrain boundaries and this led to subgrain growth in the Goss crystal. Thus the effect of crystallographic orientation is related to the deformation microstructure, the subgrain boundaries and the distribution of their disorientations.
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Adish Majumdar. Vertex dynamics simulations of subgrain growth in Al-Mn binary alloys : Effect of crystallographic orientation. Other. Ecole Nationale Supérieure des Mines de Saint-Etienne, 2013. English. ⟨NNT : 2013EMSE0689⟩. ⟨tel-00862402⟩

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