Non-ferromagnetic Ni-based alloy base strip with cubic texture, and preparation method thereof

Abstract

The invention discloses a preparation method for a non-ferromagnetic Ni-based alloy base strip with a cubic texture. The preparation method comprises the following steps: (1) preparation for an initial alloy billet: a nickel-tungsten-carbon alloy cast ingot containing carbon with an atomic percent of 0.005%-0.01% and tungsten with an atomic percent of 9.5% is obtained through a smelting method, and the initial alloy billet is obtained through forging and hot-rolling at first; (2) cold-rolling for the alloy billet: the oxide skin of the obtained initial alloy billet is removed and then high-deformation-amount cold-rolling is carried out, the total deformation amount is 99.5%-99.8%, and a cold-rolled nickel-tungsten-carbon alloy base strip is obtained; and (3) recrystallization heat treatment for the cold-rolled alloy base strip: recrystallization heat treatment is carried out on the obtained cold-rolled alloy base strip to obtain a nickel-tungsten-carbon alloy base strip with a strong cubic texture, and the recrystallization heat treatment process is as follows: heat insulation is carried out for 2-2.5 hours at 1230 DEG C-1280 DEG C, the heating speed is 3 DEG C / min-7 DEG C / min, andthe protective atmosphere is pure hydrogen. According to the preparation method, the base strip is capable of obtaining the strong cubic texture, non-ferromagnetic in a liquid nitrogen temperature area, and high in yield strength.

Description

technical field [0001] The invention relates to a textured metal base belt for a high-temperature coating superconductor, in particular to a non-ferromagnetic cubic textured Ni-based alloy base belt and a preparation method thereof. Background technique [0002] The second-generation high-temperature coated superconductor has high current density, irreversible field and excellent conductivity under high magnetic field, making it possible for YBCO-coated superconductors to replace bismuth-based superconductors in the fields of superconducting transmission cables and superconducting motors. [0003] The main structure of coated superconducting materials is divided into: metal base strip, transition layer and superconducting layer. For coated superconducting strips prepared by RABiTS technology, that is, calendering-assisted biaxial texture technology, a strong cubic texture is obtained. The ductile metal substrate tape is the basis for obtaining high-performance coated superco...

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Problems solved by technology

At present, the preparation technology of the textured Ni-5at.% W alloy substrate has been developed very maturely, and many units have been able to produce it industrially. It will cause hysteresis loss, and the yield strength is low, which limits its application range

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 obtain a strong cubic texture by traditional metal baseband preparation techniques

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