▎ 摘　　要

Cu-Nb microcomposite with 7 cores reinforced by graphene coated with niobium powder and reinforced by pure niobium powder with 7 cores were prepared by accumulative drawing and bundling process. The breakage phenomenon of wire in plastic processing was significantly improved after the optimization of heat treatment process, especially the wire reinforced by graphene coated with niobium powder, which has a regular uniform distribution of the core and a good coordination. Through the analysis of the microstructure, mechanical properties and electrical properties of the two kinds of wires with different sizes (Phi 2.49 mm, Phi 2.29 mm, Phi 2.02 mm, Phi 1.84 mm), the results show that the mechanical properties of Cu-Nb wire reinforced by graphene coated with niobium powder increase only tens of MPa compared with those of Cu-Nb wire reinforced by pure niobium powder, however, the conductivity of the Cu-Nb wire reinforced by graphene coated with niobium powder increases obviously, reaching 10%IACS. Finally, the plastic deformation mechanism of two kinds of the wires were analyzed.