| SiC reinforced aluminum matrix composites are extensively used in aerospace, automotive and many other industries. Their low ductility and low toughness are major shortcomings. In this study the microstructure of Al {dollar}rm 6092/17%SiCsb{lcub}p{rcub}{dollar} metal matrix composite (MMC) was investigated using transmission electron microscope. The effects of the microstructure of the composite on the mechanical properties, especially ductility and toughness are discussed. In the aluminum metal matrix the aging precipitates were found to be a mixture of G.P. zones and metastable phase {dollar}betasp{lcub}primeprime{rcub}.{dollar} The morphology, distribution and crystal structure of the precipitates were studied. The orientation relationship between SiC particles and the aluminum matrix was investigated. It was found that no special orientation existed between the SiC particles and the aluminum matrix. No detectable interlayer was found at the interface of the SiC particles and the aluminum matrix. Third phase particles were found in the system with both TEM and SEM techniques. These particles might be SiC fragments. |
