The current work investigates the impression creep behavior of the die-cast MRI230D alloy. The impression creep experiments are carried out in the temperature range of 150–225 °C and stress range 225–325 MPa by impressing a cylindrical indenter on the surface of the specimen. The microstructure of MRI230D consists of α-Mg phase, (Mg,Al) 2 Ca (C36) phase, and a few Al-Mn-rich phases. All the creep plots exhibit a well-defined primary creep followed by secondary (steady state) creep. The tertiary stage is missing in all the plots owing to the compressive nature of the tests. XRD and microstructural observation of the as-cast and creep tested specimens confirm the superior creep resistance of the MRI230D alloy due to the presence of the thermally stable C36 phase along grain boundaries.
Dehury et al. (Tue,) studied this question.