Microstructure Refinement by Y_2O_3 in Semisolid A356 Alloy

摘要

The semisolid A356 alloy slurry, which was grain-refined by Y_2O_3, was manufactured by low superheat pouring. The effects of grain-refine on the morphology and the grain size of the primary phase in semisolid A356 alloy were researched. The results indicated that semisolid A356 alloy contained Y_2O_3 with particle-like and rosette-like primary phases could be prepared by low superheat pouring. The grain size and particle morphology of primary phase in semisolid A356 alloy were markedly improved by Y_2O_3. The refining mechanism of Y_2O_3 on the morphology and the grain size of the primary αphase in semisolid A356 alloy was delved.