Analysis of the creep response of a fine-grained magnesium-rare earths alloy produced by rapid solidification

Abstract

The creep response of a experimental Mg-Zn-Ca-Ce-La alloy produced by rapid solidification was investigated at temperatures ranging from 498 to 548K, under stresses from 7 to 50MPa. The creep curves exhibited a short primary region, during which the strain rate decreases, followed by a short minimum creep rate range, and by a very long tertiary stage. The analysis of the creep rate dependence on applied stress at different strain suggested that the creep mechanisms was cross slip on non-basal plane, or alternatively glide of dislocation on pyramidal slip system controlled by nucleation of kink motion.