CORROSION AND MECHANICAL BEHAVIOR OF COPPER-NIOBIUM NANO-FILAMENTARY MICRO-COMPOSITES FOR HIGH PERFORMANCE ELECTRICAL CONDUCTOR WIRE

摘要

Corrosion behavior of heavily drawn bundled Copper-niobium filamentary micro-composite was studied as a function of niobium content to develop the relationship between microstructure and corrosion behavior in aqueous 30% HCI-FeCl3 solution. TEM observation revealed that niobium filaments were distributed regularly in copper matrix along the sides of a triangular unit cell in the transverse section and more sub-grain boundaries were absorbed at copper/niobium phase boundaries with increasing niobium content. The corrosion potential and rate in aqueous 30% HC1-10% Fe Cl3 was -680.3mVSHE and 1.179×10-5 A/cm2. The corrosion potential and rate decreased as increasing niobium content and FeCl3. The yield stress can be described as the sum of the substructure strengthening component due to elongated grains, subgrains and/or cells, the phase boundary strengthening term associated with the Hall-Petch type interaction between dislocations and phase boundaries and precipitate strengthening component.