Abstract
We report the role of grain boundary segregation on microstructure development during hot-rolling of Mg-3Al-0.8Zn-0.4Mn (mass%, AZ31) alloy. Annealing at 420 °C before hot-rolling induces strong grain boundary segregation of Al and Zn, forming thin solute-depleted regions near the grain boundaries. This facilitates dynamic recrystallization at the grain boundaries and induces strong basal texture. On the other hand, annealing at 500 °C reduces the grain boundary segregation, hindering the dynamic recrystallization during hot-rolling. As a result, a weak rolling-direction-split texture occurs during subsequent annealing, and this improves the stretch formability of the AZ31 alloy sheet.
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