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

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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References

  1. 1.

    J. D. Livingston andH. W. Schadler,Progr. Mater. Sci. 12 (1964) 183.

    Google Scholar 

  2. 2.

    K. M. Olsen, R. F. Jack, E. O. Fuchs, andF. S. L. Hsu, “Superconductors” AIME conf. 123 (1962).

  3. 3.

    G. D. Kneip, J. O. Betterton, D. S. Easton, andJ. O. Scarbrough,J. Appl. Phys. 33 (1962) 754.

    CAS  Article  Google Scholar 

  4. 4.

    R. G. Treuting, J. H. Wernick, andF. S. L. Hsu,Proc. Conf. High Magnetic Fields, MIT (1962) 597.

  5. 5.

    R. D. Cummings andW. N. Latham,J. Appl. Phys. 39 (1965) 2971.

    Article  Google Scholar 

  6. 6.

    B. S. Chandrasekhar, M. S. Walker, H. Riemersma, andF. E. Werner,Int. Conf. Low Temperature Physics,8 (1962) 345.

    Google Scholar 

  7. 7.

    H. B. Shukovsky, K. M. Ralls, andR. M. Rose,Trans. AIME 233 (1965) 1825.

    CAS  Google Scholar 

  8. 8.

    T. Komata, K. Ishihara, andM. Tanaka,Jap. J. Metals 30 (1966) 241.

    CAS  Google Scholar 

  9. 9.

    G. W. J. Waldron,J. Mater. Sci. 4 (1969) 290.

    CAS  Article  Google Scholar 

  10. 10.

    B. A. Rogers andD. F. Atkins,J. Metals 7 (1955) 1034.

    CAS  Google Scholar 

  11. 11.

    R. F. Domagala andD. J. McPherson,ibid 8 (1956) 619.

    Google Scholar 

  12. 12.

    A. C. Knapton,J. Less Common Metals 2 (1960) 113.

    CAS  Article  Google Scholar 

  13. 13.

    C. W. Berghout,Phys. Letts. 1 (1962) 292.

    CAS  Article  Google Scholar 

  14. 14.

    H. Richter, P. Wincierz, K. Anderko, andU. Zwicker,J. Less Common Metals 4 (1962) 252.

    CAS  Article  Google Scholar 

  15. 15.

    H. Hillmann andI. Pfeiffer,Z. Metalk. 58 (1967) 129.

    CAS  Google Scholar 

  16. 16.

    M. S. Walker, R. Stickler, andF. E. Werner,Met. Soc. Conf. 19 (1962) 4970.

    Google Scholar 

  17. 17.

    I. Milne andD. A. Ward, “Cryogenics” (1972) (to be published).

  18. 18.

    J. K. Hulm andR. D. Blaugher,Phys. Rev. 123 (1961) 1569.

    CAS  Article  Google Scholar 

  19. 19.

    R. F. Hehemann andS. T. Zegler,Trans. AIME 236 (1966) 1594.

    CAS  Google Scholar 

  20. 20.

    A. V. Narlikar andD. Dew-Hughes,J. Mater. Sci. 1 (1966) 317.

    CAS  Article  Google Scholar 

  21. 21.

    G. R. Love andM. L. Picklesimer,Trans. AIME 236 (1966) 430.

    CAS  Google Scholar 

  22. 22.

    I. Dietrich, R. Weyl, andU. Zwicker,Z. Metalk. 53 (1962) 721.

    CAS  Google Scholar 

  23. 23.

    J. D. Livingston,Appl. Phys. Letts. 8 (1966) 319.

    Article  Google Scholar 

  24. 24.

    D. F. Neal, A. C. Barber, A. Woolcock, andJ. A. F. Gidley,Acta Metallurgica 19 (1971) 143.

    CAS  Article  Google Scholar 

  25. 25.

    C. Baker,J. Mater. Sci. 5 (1970) 40.

    CAS  Article  Google Scholar 

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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/BF02403404

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Keywords

  • Polymer
  • Precipitation
  • Microscopy
  • Electron Microscopy
  • Transmission Electron Microscopy