Effects of Induction Quenching on the Recrystallization Behavior of a Twin-Structured Mg-Mn Alloy

Recrystallization is of great significance for improving the microstructure and mechanical properties of Mg alloys. Unlike isothermal annealing, induction quenching is featured by its higher heating rates and shorter process time and has shown great advantages in improving the mechanical properties of Fe-C alloy. However, the effect of induction quenching on the recrystallization behavior of Mg alloy has not been touched upon. Thus, we studied the effect of induction quenching on the static recrystallization behavior of Mg-Mn alloy containing {10-12} twins. The results showed that de-twinning occurs during induction quenching. The speed and degree of twin faded are related to loading conditions, induction heating temperature and twin size. Moreover, de-twinning occurs along with grain growth and nucleation of recrystallized grain. Recrystallization nucleates in the early stage of induction heating and the nucleation sites are mainly located at the junction of the grain boundary and the twin-grain boundary. In the meantime, grain growth is closely related to the total strain and induction heating temperature. Our results shed light on the influence of induction quenching on twin and grain evolution and hopefully provide a new heat treatment path for magnesium alloys.