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Biaxially Textured Constantan Alloy (Cu 55 wt%, Ni 44 wt%, Mn 1 wt%) Substrates for YBa2Cu3O7-x Coated Conductors (Postprint)
AIR FORCE RESEARCH LAB WRIGHT-PATTERSON AFB OH PROPULSION DIR/POWER DIV/MECHANICAL ENERGY CONVERSION BRANCH
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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.
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