Characteristics of High Strength and High Conductivity Cu-Nb Micro-Composites

摘要

We have fabricated Cu-Nb composites with high strength and high conductivity by bundling and drawing process for their application in high field pulsed magnets. Several kinds of composites are designed for investigation of the filament-size and interface effect on the strength and conductivity. For Cu-Nb micro-composites with a section of 5 ${rm mm}^{2}$ composed of a Cu matrix embedded $5times 10^{7}$ continuous Nb nano-fibers with a diameter of 100 nm, our results have shown that the ultimate tensile strength reaches 1 GPa while the electrical conductivity is higher than 70%IACS at room temperature. Since the size of Nb filaments is already on a nanometer scale, the size effect on microstructure and property of Cu-Nb composites has been studied.