A Constitutive Model for Predicting Hot Tearing Propensity of Magnesium Alloys

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.