Effects of Extrusion Processes on Microstructure and Properties of AZ31 Magnesium Alloy
AZ31 magnesium alloy was hot extruded at different extrusion temperatures and extrusion rates,and the microstructures and mechanical properties of the tested alloy samples before and after hot extrusion were investigated.The results show that dynamic recrystallization occurs during hot extrusion,therefore,compared to the as-cast alloy,microstructures of the extruded AZ31 alloy are refined,and the corrosion resistance and the mechanical properties are enhanced remarkably.Microstructure and mechanical properties of extruded AZ31 alloy are influenced by extrusion temperature and extrusion rate.In this experiment,the AZ31 magnesium alloy extruded at 300 ℃ with extrusion rate of 6.0mm/s can gain refined grains and good corrosion resistance and mechanical properties.