In this paper, 7.5 vol.% submicron B4Cp reinforced 19.9 vol.% pure Al and 72.6 vol.% highly alloyed 7000 series (Al-11.33Zn-4.02Mg-1.81Cu-0.37Ti-0.46Zr) aluminum matrix composites (AMCs) were prepared by powder metallurgy method, and the effects of multi-stage solid solution treatment on their microstructure and comprehensive property were investigated. The results show that the interfacial reaction between B4C particles (B4CP) and Al matrix is increased with the elevation of solid solution temperature, and the formed interfacial reaction product Al3BC is augmented. Meanwhile, more undissolved phases are dissolved into the matrix with the increase of solid solution temperature, and the quantity and size of the undissolved phases are reduced. In this case, the lattice distortion and the dislocation density are increased, thus improving the dislocation strengthening effect. After the solid solution treatment of 490℃×2h+510℃×2h+525℃×2h (water quenching at room temperature), the AMC possesses a high density of 99.51%, and its tensile strength reaches 659.51 MPa with the elongation and section shrinkage rate of 2.6% and 5.9%, respectively. The hardness and electrical conductivity of AMC are 262.9 HV and 14.93% IACS, respectively
