Abstract
Controlling the dynamic recrystallization of the hot deformation process to optimize the grain structure has been a long-standing research area. However, studies on the microstress-induced strengthening and grain refinement caused by different dynamic recrystallization modes after solid-solution treatment and artificial aging are limited. This paper examines the effect of deformation-induced precipitation on the dynamic recrystallization structure using a Gleblee-1500 machine and elucidates the dynamic recrystallization mechanism of crossover alloys. Under a hot deformation temperature of 400 °C, strain rate of 10 s−1, and deformation amount of 70 %, the alloy exhibits complete dynamic recrystallization owing to the presence of multiscale T-phase Mg32(Al Zn Cu)49. Calculations and experiments confirm that the increase in the strength of hot-compressed samples after subsequent solid-solution treatment and artificial aging is mainly due to microstress-induced strengthening and grain refinement. The results of this study provide valuable guidelines for designing a novel generation of high-strength alloys.
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