한국주조공학회

The main objective of this study is to investigate the microstructure and tensile strength of SiCp/Al alloy composites fabricated by die casting method. Die casting was performed using the preheated mold at the pouring temperature range of 620~750℃ under the pressure of 1,039 kgf/cm^2. The low speed and a following high injection speed were 0.4 and 2.1 m/s, respectively. The microstructure of SiCp/Al alloy composites fabricated by die casting method was found to be finer than that of composites fabricated by gravity casting. Also, SiC particulates were homogeneously distributed in refined Al matrix due to rapid solidification. The tensile strength of SiCp/Al alloy composites fabricated by die casting method was found to be varied with cast temperature. The maximun tensile strength of SiCp(10 vol.% and 20 vol.%)/Al alloy composites showed 380 MPa at the cast temperature of 750℃ and 363 MPa at the cast temperature of 700℃, respectively.