Life assessment of die-cast Mg–5Al–1.7Ca alloys under creep service conditions

The creep rupture behavior of a Mg–5Al–1.7Ca alloy produced via die casting was investigated at temperatures between 423 and 498 K, and the creep rupture life of the alloy was evaluated using the Larson–Miller parameter (LMP). It was demonstrated that the minimum creep rate and creep rupture life followed the phenomenological Monkman–Grant relationship. The value of the LMP was uniquely described by the logarithm of the applied stress when the Larson–Miller constant was set at 20. In addition, the applied stress and the LMP value followed a linear relationship below the yield stress. These results can be utilized to predict the long-term creep rupture life of the alloy under a given temperature condition and applied stress.