The structure and tensile properties of Al-Si alloy hybrid reinforced with alumina-aluminosilicate short fibre

Alumina-aluminosilicate fibre hybrid reinforced aluminium-silicon alloy was fabricated by a pressure infiltration route. Tensile test results at room temperature and at 300 C are reported. It is shown that the alumina-aluminosilicate fibre ratio does have a strong influence on the ultimate tensile strength (UTS) of these hybrid composites. At an alumina-aluminosilicate ratio of 3:2, the optimum UTS of hybrid metal matrix composites (MMC) was obtained. The UTS of only alumina fibre reinforced MMC was improved with increasing fibre volume fraction at 300 C. No fibre pull-out was observed on the fracture surface and longitudinal section. 15 refs.