Effects of Solid Solution Treatment on Microstructure and Properties of Mg-10Sr-5Y Master Alloy

Effects of solid solution treatment on microstructure and mechanical properties of Mg-10Sr-5Y master alloys were studied.The results indicate that solid solution treatment can modify the microstructure and improve mechanical properties of Mg-10Sr-5Y alloys.The intermetallic compounds,such as Mg 17 Sr 2 and Mg 24 Y 5 distrubited along the grain boundary,dissolve into matrix α-Mg gradually.The structure distrubites more uniformly with the solid solution temperature increasing.A little undisolved Mg 17 Sr 2 and Mg 24 Y 5 eutectic compounds distrubite on the grain boundary after solid solution treatment.When the temperature of solid solution is lower than 480℃,the hardness decreases slightly with increasing solution treatment temperature.When the temperature is more than 480℃,the hardness decreases sharply and then increases with temperature increasing,the minimum hardness is obtained at 500℃.The effect of holding time on the hardness of Mg-10Sr-5Y alloys is very little.