Biaxially Textured Constantan Alloy (Cu 55 wt%, Ni 44 wt%, Mn 1 wt%) Substrates for YBa2Cu3O7-x Coated Conductors (Postprint).

摘要

Commercially available constantan alloy rods (nominal composition Cu55-Ni44-Mn1 wt%) have been thermo-mechanically processed to develop biaxially textured substrates. It was found that the (001) recrystallization cube texture percentage could be increased from 72% to nearly 100% as the annealing temperature of the rolled substrates was increased from 750 to 1200 deg C. A full width half maximum (FWHM) of 6.5 deg in (111) phi scans and an FWHM of 4.9 deg in (100) omega scans were observed in the substrates annealed at 1200 deg C for 2 h. These substrates were found to have a Curie temperature of 35 K and so were paramagnetic at 77 K and ferromagnetic at 5 K with a saturation magnetization that is 2.5 times less than that of Ni-5 at.% W substrates. Yield strengths of highly textured constantan substrates were found to be 1.5 times that of textured pure Ni substrates at room temperature.