Effect of SiC particles on the laser sintering of Al-7Si-0.3Mg alloy

The direct laser sintering of Al–7Si–0.3Mg/SiC composites was studied. It is shown that the densification rate obeys first-order kinetics. The rate constant is found to increase at low SiC fractions but abruptly decreases at >∼5 vol.%. In the presence of ceramic particles, the melt track becomes more stable and a more continuous sintered surface is obtained. Meanwhile, significant reaction occurs between the aluminum melt and the reinforcement particles, leading to formation of Al 4 SiC 4 and silicon particles. The solidification microstructure is also altered.

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