STRESS DROP LED BY TWINNING DURING INITIAL STAGE OF HOT COMPRESSION OF TWIN-ROLL CAST Mg–5.51%Zn–0.49%Zr ALLOY

Abstract

Flow stress behavior during initial stage of hot compression of twin-roll cast ZK60 magnesium alloy was characterized by employing deformation temperature of 300°C and 400°C, and a given strain rate of 10-2 s -1. A stress drop during initial stage of hot compression at 300°C, generally led by dynamic recrystallization, was found to be attributed to twinning, correspondingly to dynamic recrystallization as deformation temperature was raised to 400°C.