14% SiC

w

（ in volumetric fraction）/Al composites were fabricated by squeeze casting method. The effects of aging treatment and annealing treatment on microstructure and properties of 14% SiC

w

/Al composites were investigated by optical microscopy

SEM and tensile testng. Microstructurd observation reveals that Si C whiskers are distributed uniformly in the composites with absence of casting defects

such as holes and porosities.The tensile strength of the composites can be improved after heat treatment

and the tensile strength reaches 321.4 MPa and 392. 7 MPa after annealing treatment and T6 treatment

which are increased by 52. 9% and 86. 8%

compared with those of the as-cast ones

respectively. A high strength aluminum matrix composites with low reinforcement content can be fabricated by squeeze casting method.