55％SiCp/6061Al (55％ is volume fraction) composites were prepared using the vacuum hot pressing method. The effects of SiCp particle size on distribution uniformity,density and bending strength of the composites were investigated. The results showed that composites with particle size grading have a dense microstructure,uniform SiCp distribution and high interfacial bonding strength between SiCp and the 6061Al alloy matrix. The bending strength of (60+25) μm composite with a mass ratio of 4∶1 raises from 395 MPa to 548 MPa. The bending strength of (120+60+25) μm composite with a mass ratio of 1∶1∶1 is the highest,reaching 397 MPa. The double grain size grading (106+25) μm composite with a mass ratio 4∶1 exhibits excellent comprehensive properties,with density>99.00％,uniformity>90.00％ and bending strength>400 MPa after heat treatment.
55％SiCp/6061Al compositevacuum hot pressinggrain size gradinguniformitydensitybending strength
万方数据
