Abstract
The influences of different Zr/Sc ratios on the microstructural evolution and mechanical performances of Al-2Si alloy were investigated in this paper. The as-cast samples were characterized and analyzed by the scanning electron microscope (SEM) with an energy dispersive spectrometer (EDS) to indicate the refining effect of the different Zr/Sc ratios on the α-Al and Si phases in Al-2Si alloy. The results indicate that the α-Al phases are refined from coarse dendritic structure to relatively fine equiaxed grains when the Zr/Sc ratio is equal to 1:1. Meanwhile, the eutectic Si phase in Al-2Si-0.2Zr-0.2Sc alloy is modified from the coarse plate and needle to fine fiber and partial granular structure, and the average roundness of eutectic Si is decreased by 75% from 16 to 4. With the refinement of α-Al phases and the modification of eutectic Si structure, the ultimate tensile strength (UTS) is improved by 53% and the elongation (EL) is increased by 64% when the Zr/Sc ratio is equal to 1:1. In addition, the UTS decreases and EL is enhanced with the increase of tensile temperature. Moreover, the fracture model of Al-2Si-0.2Zr-0.2Sc alloy in 250 °C changes into the ductile fracture.
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