Abstract
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 ( ε ˙ m ) and the creep rupture life ( t rup) follow the phenomenological Monkman–Grant relationship for each alloy; t rup = C 0 / ε ˙ m m . It is found that the exponent m is unity for the alloys and the constant C 0 is independent of creep testing temperature, which is reduced with increasing calcium concentration.
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