Preparation method of high-strength ferromagnetism-free texture Ni-W alloy base band

Abstract

The invention discloses a preparation method of a high-strength ferromagnetism-free texture Ni-W alloy base band. Firstly, a nickel tungsten alloy ingot casting with the atomic percentage of tungsten being 17-22% is obtained through vacuum induction melting, then the obtained nickel tungsten alloy ingot casting is served as the raw material, and an initial alloy billet is obtained through a continuous casting and rolling process; the initial alloy billet obtained in the above step is subjected to solution treatment, then the treated initial alloy billet is placed in a heat treatment furnace for heat preservation for 10 minutes, and then quenching is performed; the oxide skin of the alloy billet obtained in the above step is removed, then the alloy billet is subjected to cold rolling till the thickness is 100-150 microns and the cold-rolling deformation amount is 77-83%, and the nickel-tungsten alloy cold-rolled base band is obtained; the nickel-tungsten alloy cold-rolled base band obtained in the above step is subjected to aging heat treatment; and the nickel-tungsten alloy cold-rolled base band obtained after annealing is subjected to recrystallization annealing, and the hydrogen gas is served as the protection gas. The alloy base band prepared through the preparation method has high strength, free of ferromagnetism and high in yield strength and can meet the requirement for preparing high-performance coating superconducting strips.

Description

technical field [0001] The invention relates to a method for preparing a high-strength non-ferromagnetic textured Ni-W alloy base band, belonging to the technical field of textured metal base bands for high-temperature coating superconductors. Background technique [0002] The second-generation high-temperature coated superconductor has potential application value in superconducting cables, superconducting motors and other fields. Using the metal strip with strong cubic texture as the base material (base strip) to epitaxially grow the transition layer and the superconducting layer sequentially is one of the main technical routes for preparing the second-generation coated superconducting strip. [0003] At present, the cubic texture Ni-5at.%W alloy substrate used for coated superconducting tapes has been commercially produced, but because of its ferromagnetism (Tc=335K) in the liquid nitrogen temperature region, it will be difficult to use in the application of alternating cu...

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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] In order to obtain a high-performance textured metal baseband, the researchers obtained a composite baseband with a layered structure through the preparation of composite materials. This composite baseband can effectively improve the overall mechanical properties of the baseband and reduce the magnetic properties. However, the composite baseband The preparation process is more complicated, it is necessary to prepare mixed powder, the process is longer, the cost is higher, and there is no mass production at present

Studies have shown that with the increase of tungsten atom content, the Curie temperature of nickel-tungsten alloy decreases gradually, and the mechanical properties of the baseband gradually increase. The nitrogen temperature zone shows no ferromagnetism, and a single solid solution cannot be obtained when the atomic percentage of tungsten reaches 12% or more

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