Mechanical properties and microstructure of the magnesium alloy Mg-6.8Y-2.5Zn-0.5Al produced by casting and hot rolling

Abstract

In recent years, magnesium alloys have received much attention as important structural materials for lightweight components in automotive, electronic and space industries because of the low density, high specific strength, high damping capacities and good casting properties. Among various magnesium alloys, rare earth (RE) containing alloys offer high strength, excellent creep resistance and good thermal stability. Long period stacking ordered structures (LPSO) are responsible for the improved property profile in some Mg-RE alloys. One promising system is Mg-Y-Zn, predominantly processed via extrusion. Only a few studies are focused on hot rolling. The present paper presents the development of a rolling technology including pass schedule and heat treatment for the magnesium alloy Mg-6.8Y-2.5Zn-0.5Al in as-cast condition in order to produce sheets with a final thickness of 2.5 mm, which offers a good property profile. The investigations are accompanied by the characterization of the microstructure via optical and scanning electron microscopy as well as the determination of the mechanical properties.