Abstract
In this work, static recrystallization induced by deformations twins in cryogenic rolled AZ61 alloy during electric pulse treatment is investigated by using quasi-in-situ electron backscattered diffraction. Besides of the {10 1- 2} tensile twins, {10 1- 1} compression twins, {10 1- 2}-{10 1- 1} double twins are also observed in the as-deformed AZ61 alloy. It has been found that recrystallization occurs preferentially at the early stage of electric pulse treatment, with {10 1- 2}-{10 1- 1} double twins and {10 1- 1} compression twins being effective nucleation sites for recrystallization. In contrast, lenticular {10 1- 2} tensile twins are consumed by surrounding grains that are with growth advantage. Our results suggest a feasible way to tailor the microstructure of Mg alloys through cryogenic rolling and electrical pulse accelerated recrystallization.
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