Twins, recrystallization and texture evolution of a Mg–5.99Zn–1.76Ca–0.35Mn (wt.%) alloy during indirect extrusion process

The microstructural evolution of a Mg–5.99Zn–1.76Ca–0.35Mn (wt.%) alloy during indirect extrusion at 350 °C was systematically examined by electron backscattering diffraction analysis. The {101¯2}〈1¯011〉 extension twin played a dominant role in the formation of an undynamically recrystallized area and an extrusion basal fiber texture. Fine-grained structures were preferentially formed in the untwinned matrix and near the intermetallic compounds due to continuous dynamically recrystallization (DRX). The spacing between the fragmented compound bandings became smaller as the extrusion process proceeded, leading to a high DRX volume fraction of 98%.