Abstract: SiC_p/2009Al composites were prepared by introducing SiC particles with different mass fractions (0, 1%, 3% and 5%) into 2009Al alloy by hot isostatic pressing process, followed by hot extrusion, solution and aging treatment, and the effects of the process on microstructure and properties of the composites were investigated. The results show that the composites with uniform grain and uniform dispersion of SiC can be prepared by the hot isostatic pressing process, and the SiC particles are well bonded with the interface of Al matrix. the microstructure of the composites is obviously changed by the extrusion process, the reinforcing SiC particles are broken and refined and homogeneously distributed along the extruded flow in the matrix when the content of SiC is lower (≤3%), while when the SiC content is higher (>3%), there is a slight agglomeration of SiC particles. After solution and aging treatment, the uniformity of matrix grain size is improved, and the precipitated second phase is fine and uniformly dispersed in the matrix. By hot extrusion, solution and aging treatment, the SiC_p/2009Al composites can obtain superior comprehensive mechanical properties. When 3% SiC is introduced, the preferable mechanical properties of the composites are obtained with tensile strength of 492.7 MPa, yield strength of 400.9 MPa, elongation after fracture of 12.7%, hardness of 131 HBW, and a good wear resistance at room temperature.

Key words: SiC_p/2009Al composites, hot isostatic pressure, mechanical properties, wear resistance