A feature of the reaction between Al and SiC particles in an MMC

Al reacts with SiC in metal matrix composites, resulting in the deterioration of properties. This communication reports a specific feature in the microstructure of SiC particle reinforced Al alloy that is generated by this reaction. Approximately rectangular pits are formed on the SiC particles that are readily detectable by optical and scanning electron microscopic observations. A possible mechanism for forming the pits is also stated.