Abstract
The effect of alloying elements on the dispersions of α-SiC, β-SiC, Al2O3 and SiO2 into molten aluminum was investigated. The dispersion time of β-SiC particles in the molten aluminum was considerably longer than that of α-SiC particles at 1073K. However, at higher temperature, it became short and the difference in the dispersion time between α-SiC and β-SiC particles decreased. The dispersion time for β-SiC was decreased by adding the alloying elements such as titanium, zirconium and vanadium. Moreover, the dispersions of α-SiC and β-SiC were improved by adding calcium in aluminum. The dispersions of Al2O3 and SiO2 in aluminum were difficult, but by adding calcum in the aluminum those particles were dispersed easily. The calcium or titanium concentrated layer was detected by EPMA at the interface between particle and metal matrix.
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