A Constitutive Model for Predicting Hot Tearing Propensity of Magnesium Alloys

Abstract

Hot tearing, a severe casting defect in magnesium ingots, necessitates the development of constitutive relations to accurately predict the susceptibility of magnesium alloys. In this study, we propose an elastic–viscoplastic (E–V) model for forecasting the hot tearing propensity of Mg–Zn–Cu alloys. Our findings demonstrate that the E–V model yields a hot tearing indicator (HTI) that closely aligns with experimental results compared to the elastic–plastic (E–P) model. Moreover, the E–V model successfully synchronizes with experimental data regarding the initiation temperature for hot tearing. Notably, considering viscoplastic strain leads to higher strain values in the E–V model than those observed in the E–P model. Furthermore, our research highlights that employing an E–V approach is more suitable for predicting hot tearing in magnesium alloys and provides valuable insights into evaluating casting defects within this material system.