【摘要】 采用粉末套管工艺,结合集束拉拔技术成功制备出了石墨烯包覆铌粉增强Cu-Nb的7芯复合线材及纯铌粉增强Cu-Nb的7芯复合线材。通过优化热处理工艺,线材在塑性变形过程中的断芯现象得到了明显的改善,尤其是石墨烯包覆铌粉增强Cu-Nb复合线材,其芯丝分布较为规则和均匀,协调变形能力较好。通过对不同尺寸(Φ2.49 mm、Φ2.29mm、Φ2.02mm、Φ1.84mm)的2种线材的微观结构、力学性能及电学性能的分析,结果表明,相比同尺寸条件下纯铌粉增强Cu-Nb线材,石墨烯包覆铌粉增强Cu-Nb线材的力学性能虽然仅提高了几十个MPa,但其导电性明显增强,接近10%IACS,最后分析了2种不同尺寸线材的塑性变形机制及引起线材性能变化的微观机理。更多还原

【Abstract】 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(Φ2.49 mm, Φ2.29 mm, Φ2.02 mm, Φ1.84 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.更多还原