▎ 摘　　要

Graphene oxide nanosheets reinforced Cu matrix composites were prepared using ball milling process and spark plasma sintering (SPS). Effects of ball milling times on morphology of composites powders were studied. Furthermore, microstructure evolution and properties of sintered composites were investigated. Results show that the size and shape of the composites gradually transformed from regular sphericity to flake with the increase in ball milling times. Correspondingly, the average flake diameter of Cu alloy powders increased gradually from 7.2 +/- 0.5 to 25.0 +/- 1.0 mu m. Compared with the matrix alloy, the tensile strength of the composites increases significantly and the elongation decreases gradually. For 20 h of ball milling, the yield strength of composites increased by 35% from 126 to 170 MPa, and elongation decreases from 44 to 31%. However, for 60 h of ball milling, the tensile strength and yield strength increased to 290 and 211 MPa, respectively, while the elongation significantly descends. Besides, during the ball milling, the conductivity of composite gets a slight decrease owing to the increasing degree of powder defects.