Creep rupture properties of die-cast Mg–Al–Ca alloys

Creep rupture tests were performed for die-cast AM50 + xCa (x = 0, 0.47, 0.95 and 1.72 mass pct) alloys at temperatures between 423 and 498 K. The creep curve for the alloys is characterized by a minimum in the creep rate, and the decrease in creep rate during transient stage becomes pronounced with calcium concentration. The minimum creep rate image and the creep rupture life (trup) follow the phenomenological Monkman–Grant relationship for each alloy; image. It is found that the exponent m is unity for the alloys and the constant C0 is independent of creep testing temperature, which is reduced with increasing calcium concentration.