Interface Reaction in SiC Reinforced Al3Ti-Based Intermetallic Matrix Composites

The Al3Ti-based L12 intermetallic alloy Al66Fe9Ti25 has shown low density, high oxidation resistance, good strength and appreciable compression ductility at room temperature. To explore the approach of combined toughening and strengthening of this alloy, composites are being studied. The interface reactions between Al66Fe9Ti25 matrix and SiC reinforcement material during different fabrication processes were investigated using SEM, EDS, EPA and X-ray diffraction analyses. The extent of reaction was determined and the reaction products were identified. It was found that SiC is chemically incompatible with the Al66Fe9Ti25 matrix, strong interfacial reactions occurred during fabrication and the formation of ternary compounds leads to the deterioration of the matrix alloy.