In order to investigate the effect of SiC particle size on the microstructure and mechanical properties of SiCp/Al composites,three kinds of SiCp/2024Al composites containing 55％(volume fraction)SiC particles with size compositions being 100％10 μm,25％10 μm+75％76 μm and 100％76 μm were fabricated by hot isostatic pressing and labelled as S,G and L,respectively.The results show that all the three SiC/2024Al composites contain SiC,Al and Al2Cu phases.The flexural strength of the tested composites can be enhanced by increasing the proportion of fine SiC particles.The flexural strengths of S,G and L composites are 515,489 and 422 MPa,respectively,and the corresponding fracture strains are 0.25％,0.30％and 0.22％,respectively,indicating that the SiC particle gradation is an effective method to improve the density and the fracture strain of the composite.After annealing at 490 ℃,the flexural strengths of the three composites decrease to 494,470 and 368 MPa,respectively,and the corresponding fracture strains increase significantly to 0.43％,0.39％and 0.37％,respectively.
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