Solidification of squeeze casting SiC/Al co-continuous composites

Acta Metall Sin

2006, Vol. 42

Issue (3): 325-330 DOI:

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Solidification of squeeze casting SiC/Al co-continuous composites

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. Solidification of squeeze casting SiC/Al co-continuous composites. Acta Metall Sin, 2006, 42(3): 325-330 .

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Abstract SiC/Al co-continuous composites were fabricated by squeeze casting method, and the effect of SiC foam and process parameters on their solidification, the mechanism of solidification were investigated. The results show the process parameters play important roles in the solidification of composites. The microstructure of composites fabricated by positive squeeze is more uniform than that of composites made by inverse squeeze. The grain of composites is becoming smaller with the increase of squeeze casting pressure, but the change is not obvious. And the grains of composites is also bigger with the enhance of preheat temperature of SiC foam reinforcement. The size of grain is not obviously change, but the morphology of grain is different when the reinforcement is joined into the matrix alloy. The column dendrite that is perpendicular to the strut of SiC foam is easily got when the aperture of reinforcement is smaller. When SiC／Al composites start to solidify, the primary column dendrite α－Al is gotten near the strut of SiC foam, firstly. Then column dendrite α－Al is present after α－Al is growing into the central of aperture. At last, the eutectic silicon appears at the central of aperture where different column dendrite α－Al gathers before the eutectic reaction occurs at the surface of strut.

Key words: co-continuous composites process parameters SiC foam solidification mechanism

Received: 08 August 2005

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