Anomalous reheating behavior of SiCp/Al composite with high volume fraction reinforcement

Abstract

The reheating behavior of 50 vol.% SiCp/Al squeeze casting composite was investigated at temperatures ranging from 600 o C to 900 o C using XRD and SEM techniques from the microstructural point of view. It was found that SiCp/Al composite could hold its original shape while being reheated at temperatures elevated even far above the melting temperature of pure Al. The high volume fraction of SiC reinforcement, which would restrict the fluidity of molten Al matrix and the reconfiguration of SiC particles during the reheating of SiCp/ Al composite, was thought to be responsible for the "remelting resistance" of the SiCp/Al composite. The extent of the reaction between the SiC particles and molten Al was found to increase with increased reheating temperature. From the viewpoint of controlling the formation of aluminum carbide, reheating temperature either for recycling or for remelting processing of the SiCp/Al composite, a temperature lower than 750 o C would be better. Despite its being unfavorable to remelting or recycling processing, the remelting resistance of the SiCp/Al composite with high volume fraction reinforcement is attractive for thermal function and high temperature applications.

Fabrication, microstructures and properties of 50 vol.-% SiCp/6061Al composites via a pressureless sintering technique

“…High-volume SiCp/Al composites are recognised as the typical representative of the third-generation electronic packaging materials, due to their high thermal conductivity (TC) and controllable coefficient of thermal expansion (CTE). Meanwhile, the composites also act as important structural materials in the areas of aerospace, precision instruments and so on, owing to their high strength, high stiffness and low density [1][2][3][4].…”

Study on Atmospheric Corrosion Behaviour of Sicp/Al Composite

“…Al alloy reinforced by SiCp (SiCp/Al composite) has some excellent properties, such as high specific strength, specific models, high hardness, low density, low expand thermal coefficient, isotropic homogeneity, resistance to wear and corrosion and so on [1][2][3][4][5][6][7], and it is being potential competitive material in the field of navigational, aeronautics and astronautics, machine, electron [8][9][10][11]. Nowadays, most people have most time spent in investigating those properties of SiCp/Al composite, such as mechanical property, dimensional stability and resistance to wear.…”