Abstract
The strengthening of discontinuous SiC/Al composites has shown to be the result of the high dislocation density in the Al matrix. This high dislocation density is the result of the difference in thermal coefficients of expansion between Al and SiC and the very strong bond between Al and SiC. The fracture process in these composites is controlled by the degree of plastic constraint of the matrix by SiC particulates. Low volume percent composites exhibit ductile fracture controlled by void nucleation. In composites with a high content of SiC (> 20%), void nucleation does not seem to be a controlling factor.
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