Spheroidization of Primary Silicon in Hypereutectic Al-Si Alloy by Heat Treatment
The modified hypereutectic Al-24Si alloy was subjected to solid state diffusion heating and semi-solid heat-ing treatment to promote the homogenization and spheroidization of primary silicon,and the optimal process was deter-mined to improve the properties.The results indicate that the optimal heating parameter of solid state diffusion is 540℃for 12 h,and primary silicon is grown up and become passivated.The optimal parameter for semi-solid heating is 615℃for 15 min,and morphology of primary silicon is significantly improved and spheroidized,where the shape fac-tor can reach above 0.80.
Hypereutectic Al-Si AlloyPrimary SiliconSolid State Diffusion HeatingSemi-solid HeatingSpheroidize
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