Abstract:Micro-B4C/nano-Ti hybrid particulates reinforced copper matrix composites (CTBCs) were successfully prepared by high energy ball milling (HEBM) and spark plasma sintering (SPS). The microstructures and morphologies were characterized by X-ray diffraction (XRD), optical microscopy (OM), and scanning electron microscopy (SEM) equipped with energy dispersive spectroscopy (EDS). The results demonstrate that presence of uniformly distributed (B4C+Ti) particles and a good interfacial bond between reinforcement and the Cu matrix. Besides, the interface bondingSmechanism was metallurgical bonding and mechanical bonding. The relative density of the as-SPSed samples was tested by Archimedes drainage method. Mechanical properties (microhardness, tensile yield strength, ultimate tensile strength and elongation to fracture) of CTBCs were significantly improved in comparison to the pure copper, which was mainly due to the load transfer, grain refinement and thermal. Finally, the fracture surface of the tensile sample presented ductile fractures.