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Evidence for the control of the critical current density of Nb-25% Zr superconducting wires by the dislocation substructure

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Abstract

Transmission electron microscopy of longitudinal sections of 250μm diameter Nb-25% Zr wire has revealed that annealing treatments which maximiseJ c can cause polygonisation of the as-drawn dislocation substructure, precipitation ofα Zr, precipitation ofβ Zr, or recrystallisation ofβ Nb. It is argued that the polygonised structure is the one which is most effective in controllingJ c.

T c data has provided some very useful information for assessing the constitutional state of the material.

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Authors and Affiliations

  1. Central Electricity Research Laboratories, Kelvin Avenue, Leatherhead, Surrey, UK

    I. Milne

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  1. I. Milne
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Milne, I. Evidence for the control of the critical current density of Nb-25% Zr superconducting wires by the dislocation substructure. J Mater Sci 7, 413–421 (1972). https://doi.org/10.1007/BF00553764

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