Strong Cube Texture Formation in Heavily Cold-Rolled Ni8W/Ni12W/Ni8W Composite Alloy Substrates Used in YBCO Coated Conductors

Three types of Ni8W/Ni12W/Ni8W composite substrates with strong cube texture, high yield strength, and low magnetization were produced by heavy cold rolling and annealing processes. The three types of composite substrates have the same thickness, but the ratios of thickness between Ni-8 at%W and Ni-12 at%W layer are different. The contents of tungsten exceed 9.3 at%, 10 at%, and 10.3 at% in the three types of obtained substrates. The presence of Ni alloys with higher W content in the Ni-12 at%W of the three composite substrates strongly enhanced the mechanical properties with about 290, 300 and 315 MPa respectively, and decreased the ferromagnetic behavior of the whole substrates. Additionally, it was found that an area that enhances cubic nucleation and growth in the Ni8W layer of composite substrates.