Method for producing Nb3Al superconducting wire precursor through elastic plastic processing

Abstract

The invention discloses a method for producing an Nb3Al superconducting wire precursor through elastic plastic processing. The method for producing the Nb3Al superconducting wire precursor through the elastic plastic processing comprises assembling an aluminum bar, a niobium tube and a copper tube to obtain a copper, niobium and aluminum composited bar; performing electric plastic drawing machining on the copper, niobium and aluminum composited bar through an electric plastic drawing device to obtain a subgroup element; performing drawing machining through the electric plastic drawing device again after the subgroup element is assembled and squeezed to finally obtain a multi-core Nb3Al superconducting wire precursor. The method for producing the Nb3Al superconducting wire precursor through the elastic plastic processing has the advantages of slowing down processing hardening, greatly improving the material plastic deformation capability, solving the problem that a wire breaks down during drawing due to the facts that the niobium and the aluminum are large in melting point difference and accordingly effective stress relief annealing cannot be performed, meanwhile shortening the production period and reducing production costs due to the fact that high-energy electric pulses are introduced during wire machining.

Description

technical field [0001] The invention belongs to the technical field of preparation methods of superconducting materials, and in particular relates to the preparation of Nb by electroplastic processing. 3 A method for an Al superconducting wire precursor. Background technique [0002] Practical low-temperature superconducting materials are usually processed into composite wires with multi-core structures. The preparation process involves a large number of drawing and extrusion processes. This preparation process will lead to work hardening of the wires and requires multiple stress reliefs. Annealing to improve the plasticity of the wire. in Nb 3 The different preparation methods of Al superconducting materials all involve the drawing and extrusion of wire rods. Since the melting points of Nb and Al are too different, it is impossible to carry out effective stress relief annealing on the two materials, and a higher temperature is selected for stress relief. During stress an...

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Problems solved by technology

[0003] The object of the present invention is to provide a kind of electroplastic processing preparation Nb 3 The method of Al superconducting wire precursor solves the problem of preparing Nb 3 For Al superconducting wires, due to the large difference between the melting points of Nb and Al, effective stress relief annealing cannot be performed, which leads to the problem of wire breakage during the drawing process.

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