Biaxially Textured Copper and Copper-Iron Alloy Substrates for Use in YBa2Cu3O7-x Coated Conductors

摘要

Copper and Cu/Fe (Fe2.35 wt%) alloy substrates were thermo- mechanically processed and the biaxial texture development, magnetic properties, yield strength, and electrical resistivity were studied and compared to determine their suitability as substrates for high-temperature superconducting coated conductor applications. Average full width half maximum (FWHM) of 5.5 in Phi scans (in-plane alignment), and 6.6 in omega scans (out-of-plane alignment) was obtained in copper samples. Cu-Fe samples showed 5.9 FWHM in Phi scans and 5.9 in omega scans. Even with the presence of 2.35% Fe in the Cu-alloy, the saturation magnetization (Msat) value was found to be 4.27 emu g(exp -1) at 5 K, which is less than in Ni samples by an order of magnitude and comparable to that of Ni-9 at.% W substrates. The yield strength of the annealed Cu-Fe alloy substrate was found to be at least two times higher than that of similarly annealed copper substrates. The electrical resistivity of Cu-Fe alloy was found to be an order of magnitude higher than that of pure copper at 77 K.