In-situ TEM observations on interaction of basal <a> dislocations and β′ phases in a Mg–Gd binary alloy

Abstract

Here we report in-situ TEM observations on interaction between dislocations and β′ phases in aged Mg–Gd alloys. The slipping <a> dislocations squash into the interface and bow out to bypass the β′ phase, leading to a zigzag route of plastic flow. Orowan mechanism is determined as the main strengthen mechanism.