The effect of different impurity levels in nickel on the quality of
the primary recrystallization cube texture after intense cold rolling was
investigated. Texture sharpness and thermal stability in the 99.9 at% nickel
tapes could be improved by micro-alloying with molybdenum and tungsten as well
as with niobium and tantalum. Furthermore, micro-alloying reduced the
susceptibility of the substrate materials against grain boundary grooving at
processing temperatures in the range of about 800 °C. Highly alloyed
nickel with 5 at% tungsten was not susceptible to thermal etching effects
independent of the processing route, i.e. melting or powder metallurgy. Cube
textures were obtained for different nickel-refractory metal alloys with
characteristic in-plane orientations of FWHM: 4-8°.
The performance of this group of substrate materials for coating with ceramic
buffer and superconductor layers could be proven by the achieved maximum
critical current density of 1.2 MA cm-2 at liquid nitrogen temperature
and zero magnetic field.
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