Enhancing wettability of SiC in semisolid A356 aluminium matrix composites
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Publication Details
Author list: Poolthong N., Poolsawat K., Nomura H., Pearce J.T.H.
Publisher: Taylor and Francis Group
Publication year: 2008
Volume number: 21
Issue number: #
Start page: 203
End page: 208
Number of pages: 6
ISSN: 1364-0461
eISSN: 1743-1336
Languages: English-Great Britain (EN-GB)
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Abstract
Stir casting plus cooling plate technique has been used for the fabrication of Al matrix composites based on alloy 356. Improvement of the wettability of SiC particles was carried out, employing the oxidisation of SiC particles, the use of wetting agents by adding magnesium into the matrix and the coating of SiC particles using a sol-gel technique. The introduction of SiC particles into partially solidified alloy with high viscosity prevents the particles from floating and agglomerating. Unoxidised SiC particles are mostly detached from the Al matrix during the grinding suggesting poor adhesion and poor wettability between the matrix and the particles. Oxidised SiC particles and sol-gel silica coated SiC particles indicate good binding between composite and matrix. The use of magnesium promoted wettability of SiC with A356 alloy. The eutectic silicon phase formed on the surface of SiC particles during solidification may be due to nucleation effects provided by the particles. ฉ 2008 W. S. Maney & Son Ltd.
Keywords
Metal matrix composite, Rheocasting, Semisolid processing, sol-gel
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