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The critical current density of deformed and annealed superconducting Nb-26% Zr and Nb-32% Zr and its dependence on the amount of deformation

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Abstract

A study of the low-field critical current densities (computed from magnetization data) which can be achieved by heat-treating for 1 h Nb-Zr alloys deformed various amounts, has shown that a peak critical current density is always reached after annealing at around 750°C. The magnitude of this peak depends upon the amount of deformation, but is not increased by deforming beyond 80%. Superconducting transition temperatures are also reported.

The microstructure was unusual in that deformation was very unevenly distributed and there was little tendency for the dislocations to cross-slip or to form a cellular structure. Precipitation ofΒ Zr occurred in regions of high deformation only, so that equilibrium was not achieved below 80% deformation. The measured superconducting properties are explained in terms of this microstructure, withΒ Zr as the dominant flux pinning agent.

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Author notes

  1. T. R. Finlayson

    Present address: Physics Department, Monash University, 3168, Clayton, Victoria, Australia

Authors and Affiliations

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

    T. R. Finlayson & I. Milne

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  1. T. R. Finlayson
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  2. I. Milne
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Finlayson, T.R., Milne, I. The critical current density of deformed and annealed superconducting Nb-26% Zr and Nb-32% Zr and its dependence on the amount of deformation. J Mater Sci 7, 1391–1400 (1972). https://doi.org/10.1007/BF00574931

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  • DOI: https://doi.org/10.1007/BF00574931

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