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

Einfluss von SiC-Partikeln auf das Laserstrahlsintern einer Al-7Si-0.3Mg-Legierung
: Simchi, A.; Godlinski, D.


Scripta materialia 59 (2008), Nr.2, S.199-202
ISSN: 1359-6462
Fraunhofer IFAM ()
Laserstrahlsintern; schnelle Prototypentwicklung; Aluminium-Silizium-Legierung; Siliciumcarbid; dispersionsgehärtete Legierung; eutektisches Gefüge; Metallpulver; Aluminiumsiliciummagnesiumlegierung

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 larger than about 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 Al4SiC4 and silicon particles. The solidification microstructure is also altered.
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