Quasi-in-situ EBSD study of fast static recrystallization evolution of AZ61 alloy at twinning interactions during electric pulse treatment

Abstract

In this work, the quasi-in-situ electron backscattered diffraction (EBSD) is employed to investigate the static recrystallization occurring at the interface of deformation twinning interactions in liquid nitrogen temperature (LNT) rolled AZ61 alloy during electric pulse treatment (EPT). It was found that recrystallization nucleation occurred at the 10 1 ¯ 2 tensile twin (TTW) interaction, after which new grains and part of the original grains consumed 10 1 ¯ 2 TTW and grow up. By contrast, recrystallization nucleation occurs not only at the 10 1 ¯ 1 − 10 1 ¯ 2 double twin (DTW) interactions but also within twin boundaries during subsequent EPT. When multiple twins come into being in the exact grain, the recrystallization growth showed obvious directionality: first, recrystallization grains grow along with 10 1 ¯ 1 − 10 1 ¯ 2 DTW and 10 1 ¯ 1 CTW boundaries and consume them; then the 10 1 ¯ 2 TTWs are consumed and the growth direction of recrystallization grains shifts to along with their boundaries. • Static recrystallization induced by deformations twinning interactions in cryogenic rolled AZ61 alloy during electric pulse treatment has been investigated by using quasi- in-situ electron backscattered diffraction characterizations. • The effects of existing deformation twinning interactions on electrical pulse accelerated recrystallization behaviors have been analyzed. • By using cryogenic rolling and electrical pulse accelerated recrystallization, we suggest an effective way to tailor the microstructure of magnesium alloys.