Strong cube texture of super-high tungsten Ni–W alloy substrates used in REBCO coated conductors

Biaxially textured super-high tungsten Ni–W alloy substrates have been fabricated through the composite substrate method in view of coated conductor applications. The tungsten content exceeds 10% in the obtained substrates. The excellent super-high tungsten substrate (Ni10W) had a strong cube texture consistent with commercial Ni5W and better than Ni8W or Ni9W substrate. Furthermore, yield strength ∼310 MPa (twice of Ni5W) and saturation magnetization of only 4% to that of Ni5W at the temperature of 77 K was calculated for Ni10W substrate. The novel Ni10W substrate with strong cube texture and negligible magnetization is best suited to be utilized for 2nd generation coated conductor REBCO. It can significantly improve the progress of using the RABiTS route in the fabrication of REBCO tapes. Meantime, the mechanisms of the cube evolution and elements diffusion in super high tungsten substrate are also studied.