A novel modifier on eutectic Si and mechanical properties of Al-Si alloy

The characterization of Fe-rich phases in a high-pressure die cast hypoeutectic aluminum-silicon alloy

Al–(12, 20, 35 wt%)Si alloys were fabricated using powder metallurgy process involving hot pressing followed by hot extrusion. The effect of Si content on the microstructure [by scanning electron microscopy], the mechanical properties (hardness and tensile tests), and the thermal expansion behavior were studied in detail, respectively. Due to the friction between the Si phase and the matrix, as well as the diffusion of the Si atoms, the Si phase becomes a particulate shape after hot extrusion, and the size increases with increasing Si content. The mechanical strength increases, whereas, the elongation decreases with increasing the Si content from 12 to 35 wt%, which lead to a variation of the fracture mechanism from ductile to brittle failure. The coefficient of thermal expansion (CTE) decreases with increasing Si content as a result of restriction of Si on the Al matrix, and the measured CTE value is in good agreement with the Turner model below 573 K.

Effect of Si content on the microstructure and properties of Al–Si alloys fabricated using hot extrusion

Nucleation and growth mechanisms of nano-scaled Si precipitates in Al-7Si supersaturated solid solution

This paper studied the relationship between the residual amount of Sr and the morphology of the eutectic Si phase in A356 obtained through different modification treatment processes; additionally, the cooling rates of molds were studied. The eutectic Si phase revealed a satisfactory modification effect at residual Sr amounts above 0.01 wt % in A356 alloys cast using an iron mould. Complete modification of the eutectic Si phase could be achieved at a Sr additive amount 0.03 wt % in an A356 melt. The addition of higher amounts of Sr (~0.04–0.06 wt %) did not improve the modification effect. With the addition of 0.06 wt % Sr into A356 alloy melt and holding at 750 °C, the anti-fading capacity of Sr modification effect could be sustained for 120 minutes. More Sr is needed to obtain a good modification of eutectic Si for an A356 alloy cast using a sand mold.

https://www.mdpi.com/1996-1944/12/19/3222/pdf

The Relationship between Residual Amount of Sr and Morphology of Eutectic Si Phase in A356 Alloy.

Enhanced nucleation and refinement of eutectic Si by high number-density nano-particles in Al-10Si-0.5Sb alloys

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Enhanced nucleation and refinement of eutectic Si by high number-density nano-particles in Al-10Si-0.5Sb alloys