Preparation method for non-ferromagnetism cubic-texture nickel-tungsten alloy base band

Abstract

The invention discloses a preparation method for a non-ferromagnetism cubic-texture nickel-tungsten alloy base band. The method includes the steps that a nickel-tungsten alloy cast ingot is prepared by adopting a vacuum induction melting method, and an initial alloy blank ingot is obtained after forging and hot rolling; surface polishing is conducted on the obtained initial alloy blank ingot by utilizing mechanical polishing, oxide skin is removed, and then cold rolling is carried out till the initial alloy blank ingot is 50-75 micrometers thick and the total deformation is 90-93%, so that a nickel-tungsten alloy cold-rolled base band is obtained; and the obtained nickel-tungsten alloy cold-rolled base band is subjected to recrystallization heat treatment to obtain the nickel-tungsten alloy base band with the high cubic texture. The alloy base band has no ferromagnetism overall and is high in strength, and the requirements for preparing high-performance coating superconductive bands can be met.

Description

technical field [0001] The invention relates to a preparation method of a composite substrate, in particular to a preparation method of a nickel-tungsten alloy substrate. Background technique [0002] With the improvement of the performance of Yttrium Barium Copper Oxide (YBCO) high-temperature superconducting materials and the continuous progress of refrigeration technology, as well as its inherent physical properties, YBCO coated superconductors are used in superconducting cables, superconducting motors, etc. field has potential application value. For YBCO-coated superconducting tapes prepared by RABiTS technology, that is, calendering-assisted biaxial texture technology, obtaining a metal base tape with strong cubic texture, no ferromagnetism, and high yield strength is the key to preparing high-performance coated superconducting tapes. The key to material. [0003] At present, the cubic texture Ni-5at.%W alloy substrate used for coated superconducting tapes has been co...

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Problems solved by technology

[0003] At present, the cubic texture Ni-5at.%W alloy substrate used for coated superconducting strips has been commercially produced, but because it has ferromagnetism (Tc=335K) in the liquid nitrogen temperature region, it will be difficult to use in alternating current applications. Causes AC loss, and its yield strength is low, so it is not the material of choice for high-performance superconducting tapes

[0004] Studies have shown that as the content of tungsten atoms increases, the Curie temperature of nickel-tungsten alloys decreases gradually. When the atomic percentage of tungsten reaches more than 9%, the baseband of nickel-tungsten alloys shows no ferromagnetism in the liquid nitrogen temperature zone. However, it is difficult to prepare non-ferromagnetic nickel-tungsten alloy substrates with strong cubic texture by traditional metal substrate preparation techniques.

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