The deformation and recrystallization behaviour of an Mg-Dy alloy processed by plane strain compression
Résumé
The present study investigates the deformation and recrystallization behaviour of a Mg-0.41Dy (wt.%) alloy processed via plane strain compression (PSC) at room temperature (RT), 200, and 400°C under a strain rate of 10 −4 s −1. PSC at RT and 200°C causes the introduction of a high amount of deformation features, like extension, contraction, and double twins. Meanwhile, PSC at 400°C is characterized by the occurrence of dynamic re-crystallization. The change in the microstructures affects the mechanical response of the alloy. The deformation texture is characterized by the formation of basal < 0001 > and prismatic < 10 1 0 > fibres, while the texture intensity increases with increasing deformation temperature. The static recrystallization and grain growth ki-netics were investigated for all processed samples after subsequent annealing at 450°C for a time period ranging from 30 min to seven days. The evolution of grain size and microhardness strongly depends on the deformation temperatures. Moreover, the recrystallization rate increases with increasing deformation temperature. The Avrami exponent of recrystallization n was in the range of 0.26-0.9, indicating that the recrystallization preferentially occurs along grain boundaries and within deformation features.
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