Creep mechanism and microstructures in low-stacking fault energy type Mg-Y based dilute alloys

Abstract

Compressive creep behavior and dislocation substructures in an Mg-Y based dilute alloy have been investigated in this study. Apparent activation energy for creep in this alloy is about 190 kJ/mol. Many a-dislocations are not only on the basal planes but also the non-basal planes at 480 K and higher temperatures. On the other hand, most of the a-dislocations are on the basal planes at 450 K. The rate controlling mechanism of this alloy is considered to change from the cross-slip controlled dislocation creep to the climb controlled dislocation creep and the estimated transition temperature for the creep mechanism is ranging from 450 to 480 K.