Reserch on Preparation and Mechanical Properties of A Dual-phase Reinforced 2024Al Composites

TiB₂-C_f (Ni)/2024Al was prepared by spark plasma sintering technology in order to improve the strength and plasticity of 2024Al matrix composites. The microstructure of all the prepared composites were analyzed by SEM, the phase composition was characterized by XRD, the hardness was tested by Vickers hardness tester, the tensile mechanical properties were tested by tensile testing machine, the fracture mechanism of the prepared material was analyzed by the SEM morphology of the tensile fracture.The results show that the carbon fiber and TiB₂ particle of TiB₂-C_f(Ni)/2024Al are uniformly distributed in the 2024Al matrix whose precipitates are composed of fine Al₂Cu, Al₂CuMg, etc. The hardness of TiB₂-C_f (Ni)/2024Al is 115.8 HV, the tensile strength is 345.0 MPa, and the fracture elongation rate is 8.5%, which show 27.5%, 33.9%and 129.7%higher than that of 2024Al, respectively.