Correlation of Hardness and Silicon Morphology for Al-Si-Sb Alloy

OpenAlex İngilizce

MORPHOLOGY FOR Al-Si-Sb ALLOYIn this study, we have focused on the role of silicon morphology on the hardness of eutectic Al -12 wt.% Si -0.5 wt.% Sb alloy solidified at different cooling rates.The alloys were produced by using induction melting, arc-remelting and melt-spinning techniques.The cooling rates of the alloys were determined as 0.5, 60 and ~10 5 °C.s-1 for induction-melted, arc-remelted and meltspun alloy.The experimental results show that as the cooling rate increased the coarse silicon phase was substantially refined and its morphology altered from sharp need-like to round shape.Two exothermic peaks, attributed to precipitation and coarsening of silicon from supersaturated α-Al, were observed in the DSC curve of MS alloy.Vicker's hardness of melt-spun alloy was found two times higher than those of IMed and ARed alloys.The lowest hardness of induction-melted alloy was ascribed to the lamellar morphology of silicon, yielding decohesive rupture.This result was confirmed by finite element analyzing.