Abstract
In transmission electron microscopy examinations of cast Al matrix-SiC particulate composites, it was noted that a coating of Al 4C 3 had been formed in contact with some SiC particles. The observed epitaxial orientation relationships at the SiC Al 4C 3 interface and between the carbides and interfacial Al formed by Al 4C 3 decomposition are described. The lattice matching between SiC, Al 4C 3, and reprecipitated Al particles may result in strong bonding and thus permit crack propagation across such interfaces, contributing to the detrimental effects on fracture and fatigue associated with the presence of Al 4C 3 in aluminum-silicon carbide composites.
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