Microstructure and Mechanical Properties of SiC Reinforced AIN/AI Composites
Interconnected network of AlN/Al composites are produced by <i>in situ</i> liquid metal-gas reactions. In this study, various Al-Si-Mg alloys are nitrided in N<sub>2</sub>-4 %H<sub>2</sub> atmosphere to understand the composite growth mechanism. Both fibre and particulate SiC reinforcements are infiltrated with AlN/Al reaction product to form near dense composites and mechanical properties are compared with those of AlN particulate reinforced AlN/Al composite. The composite microstructure is found to be sensitive to the processing temperature, alloy composition and filler material size and chemistry. The variation in mechanical property is also dependent on the residual porosity. Formation of moisture sensitive Al<sub>4</sub>C<sub>3</sub> in SiC reinforced composites causes deterioration of mechanical properties. Various alternatives to prevent Al<sub>4</sub>C<sub>3</sub> formation are discussed in the text.
- ISIJ international
ISIJ international 37(10), 992-999, 1997-10-15
The Iron and Steel Institute of Japan