Effect of Initial Microstructure Prior to Extrusion on the Microstructure and Mechanical Properties of Extruded AZ80 Alloy with a Low Temperature and a Low Ratio

Abstract Magnesium (Mg) alloys are the lightest metal structural material for engineering applications and therefore have a wide market of applications. However, compared to steel aluminum alloys, Mg lower mechanical properties, which greatly limits their application. Extrusion is one most important processing methods its alloys. effect such heterogeneous microstructure achieved at low temperatures on properties lacking investigation. In this work, commercial AZ80 with different initial microstructures (as-cast as-homogenized) were selected extruded extrusion temperature 220 °C ratio 4. The two investigated. results show that homogenized-extruded (HE) sample exhibits higher strength than cast-extruded (CE) sample, mainly attributed high number density fine dynamic precipitates fraction recrystallized ultrafine grains. Compared coarse compounds existing in CE dynamical 17 (Al, Zn) 12 form HE can effectively promote recrystallization during extrusion, while they exhibit similar size orientation These facilitate designing high-strength wrought magnesium by rational construction.