Effect of cicrostructure, interface and on the aging behaviour of A356 Al/SiC_p composites

摘要

This research we used dilution method directly to pour the melting high concentration A356 / 40wt percent SiC_((p)) composite material into the molten of Al alloy, and prepared A356/0wt percent, 10wt percent, 20wt percent SiC_((p)) composite material, and finally puru into the permanent mold which is 300-500 deg C to become the casting. Then we do age hardening treatment to these composites material. We have aoso studied the influence of both the Al_3C_4 growth amount at interface and the non-uniform of SiC particulate distributed in the matrix to the aging behavior. For the A356/10wt percent SiC_((p)) composites, the hardness increase as both interface layer produce and growth increase, but decrease with non-uniformity of SiC particulate distribute in the matrix. For the A356/20wt percent SiC_((p)) composites, the age hardening would not be influenced by the non-uniform and the interface reaction layer.