Advertisement

Development of Multifilamentary Superconductors Containing Nb-40wt%Ti-18wt%Ta and Nb-41wt%Ti-28wt%Ta Ternary Alloys

  • H. Liu
  • E. Gregory
  • K. J. Faase
  • W. H. Warnes
Part of the Advances in Cryogenic Engineering Materials book series (ACRE, volume 42)

Abstract

Multifilamentary superconducting materials containing ternary alloys have been manufactured and their properties studied at 4.2K and 1.8K. Two compositions, Nb-40wt.%Ti-18wt.%Ta and Nb-41wt.%Ti-28wt.%Ta were selected as they appeared to offer the maximum enhancement of Hc2’s over the binary alloys at both 4.2K and 2.0K, respectively. Superfluid helium is now being considered for an increasing number of large devices. Thus, the study of these highly ductile ternaries at 1.8K to 2K is very important. Three 50.8 mm diameter multifilamentary billets were made from two ternary alloys and the Nb-46.5wt.%Ti binary alloy which provided a base line for comparison purposes. Critical current densities, (Jc’s) for all materials after different thermomechanical treatments were measured at 4.2K, 2.0K and 1.8K. The upper critical fields of three alloys at 4.2K and 2.0K were determined from the extrapolations of Jc’s to zero, and termed Hc2*. Volume fractions and sizes of α-Ti precipitates immediately after the heat treatments were examined. Critical temperatures, (Tc’s) for all alloys were also measured. The results of the properties measured will be discussed in this paper.

Keywords

Binary Alloy Ternary Alloy Critical Current Density Thermomechanical Treatment Superfluid Helium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

References

  1. 1.
    T. G. Berlincourt and R. R. Hake, Phys. Rev. 131: 140 (1963).CrossRefGoogle Scholar
  2. 2.
    N. R. Werthamer, E. Helfand and P.C. Hohenberg, Phys. Rev. 147: 295 (1966).CrossRefGoogle Scholar
  3. 3.
    L.J. Neuringer and Y. Shapira, Phys. Rev. Lett. 17: 81 (1966).CrossRefGoogle Scholar
  4. 4.
    M. Suenaga and K. M. Ralls, “Some Superconducting Properties of Ti-Nb-Ta Ternary Alloys,” J. Appl. Phys. 40: 11 4457(1969).Google Scholar
  5. 5.
    K. F. Hwang and D.C. Larbalestier, IEEE Trans. Magn., MAG-15(1): 400 (1979).CrossRefGoogle Scholar
  6. 6.
    H. Segal, K. Hemachalam, T. A. de Winter, and Z. J. Stekly, IEEE Trans. Magn., MAG-15(1): 807 (1979).CrossRefGoogle Scholar
  7. 7.
    D. G. Hawksworth and D. C. Larbalestier, “Enhanced Values of Hc2 in NbTi Ternary and Quaternary Alloys,” Advances in Cryogenic Engineering. 26: 479 (1980).Google Scholar
  8. 8.
    D. C. Larbalestier, “Nb-Ti Alloy Superconductors-Present Status and Potential for Improvement,” Advances in Cryogenic Engineering. 26: 10 (1980).Google Scholar
  9. 9.
    E. Gregory, T. S. Kreilick, F. S. von Goeler and J. Wong, “Preliminary Results on Properties of Ductile Superconducting Alloy for Operation to 10 Tesla and Above,” Proc. ICEC-12, (Southampton, U.K.) p 874, 1988.Google Scholar
  10. 10.
    A. D. McInturff, J. Carson, D. C. Larbalestier, P. Lee, J. McKinnel, H. Kanithi, W. McDonald and P. O’Larey, “Ternary Superconductor “NbTiTa” for High Field Superfluid Magnets,”Intermag’90, IEEE Inter. Magnet Conf, 17–20 April, Brighton, U.K., 1990.Google Scholar
  11. 11.
    H. Liu, E. Gregory, N. D. Rizzo, J. D. McCambridge, X. S. Ling and D. E. Prober, “Experimental Results on Nb 25 wt.%Ta 45wt.%Ti Superconducting Wire,” IEEE Trans. on Appl.Superconductivity. 3, 1: 1350(1993).CrossRefGoogle Scholar
  12. 12.
    G. K. Hoang, C. E. Bruzek, L Oberli and D. LeRoy, Development of Nb 44 wt.%Ti 25 wt.%Ta Based Superconducting Conductors for LHC Magnets. IEEE Trans. on Appi. Superconductivity, 5 (2): 412 (1995).CrossRefGoogle Scholar
  13. 13.
    B. G. Lazarev, O. V. Chemyj, G. E. Storozhilov, L. G. Udov, N. F. Andrievskaya, L. A. Komienko, L. S. Lazareva, N. A. Chemyak, P. A. Kutsenko, B. K. Pryandkin, Y.A. D. Starodubov, M. B. Lazareva and V. M. Gorbatenko, “The Study of the Microstructure and J, in Nb-37Ti-22Ta Superconductor Produced with Different Duration of Treatments,” Proc. 7th Int. Workshop on Critical Currents in Superconductors, p601, (1994).Google Scholar
  14. 14.
    T. Wong, D. Frost, C. V. Renaud, M. K. Rudziak, and J. Wong, “Development of Artificial Pinning Center NbTi Multifilamentary Superconductors for Commercial Applications,” Manuscript submitted to MT- 14, Tampere, Finland, June 11–16, 1995.Google Scholar
  15. 15.
    K. J. Faase, “SEMBS Technique,” LTSC Workshop, Berkeley, CA, Feb., 1992.Google Scholar
  16. 16.
    K. J. Faase, W. H. Wames, P. J. Lee and D. C. Larbalestier, “Microstructural and Compositional Gradient in the Filament-Matrix Region of Nb-Ti Wire Composites,” IEEE Trans. on Appl, Superconductivity. 5 (2): 1197 (1995).CrossRefGoogle Scholar

Copyright information

© Springer Science+Business Media New York 1996

Authors and Affiliations

  • H. Liu
    • 1
  • E. Gregory
    • 1
  • K. J. Faase
    • 2
  • W. H. Warnes
    • 2
  1. 1.IGC/Advanced SuperconductorsWaterburyUSA
  2. 2.Oregon State UniversityCorvallisUSA

Personalised recommendations