The Role of Recrystallization and Local Misorientation on the Biodegradation Behavior of Mg

Abstract

Most biomedical implants are predominantly Mg-based because of their degradable properties. The effect of recrystallization and local misorientation induced by various rolling parameters on the biodegradation of pure Mg has been systematically studied. The results reveal that an increase in recrystallization fraction and a reduction in local misorientation of grains as the rolling temperature increased was beneficial to the degradation rate of pure Mg. There is basal texture variation arising from the occurrence of high twinning activity at a lower rolling temperature which suppresses the maximum texture intensity and also increases the degradation rate. This result also reveals that grain growth was beneficial to the degradation rate of Mg, as larger grain size give a lower degradation rate. The degradation rate generally increased with decreasing rolling temperature (i.e., 350°C < 250°C < 100°C), indicating that the higher rolling temperature was beneficial to the degradation rate. This work is expected to give a better insight into the rolling process optimization of pure Mg to improve its degradation rate for biomedical applications.