Microstructure and properties of AZ31 magnesium alloy with rapid solidification
(College of Materials Engineering, Zhengzhou University, Zhengzhou 450002, China)
Abstract: Rapidly solidified (RS) AZ31 magnesium alloy ribbons were made using melt spinning technique. The results show that its microhardness increases with the wheel speed, and after heat treatment, the microhardness of the ribbons produced at 1600r/min also increases. Rapid solidification leads to reduction of grain size. When the wheel speed reaches 1600r/min, no Mg17Al12 phase precipitates, while heat treatment at 200℃ leads to precipitation of Mg17Al12 phase. Al-Mn intermetallic compounds with size no larger than 10nm appear in as-spun ribbons. The corrosion potential of the as-cast ingots is lower than that of the as-spun ribbons.
Key words: rapid solidification; magnesium alloy; microstructure; properties