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Journal of Materials Science

, Volume 4, Issue 4, pp 290–301 | Cite as

Fluxoid pinning by second phases in a superconducting niobium-zirconium alloy

  • G. W. J. Waldron
Papers

Abstract

The effects of second phases on the critical currents of superconducting niobium-zirconium alloys containing a nominal 25 wt % zirconium have been determined by superconducting magnetisation experiments. Heat treatment of annealed and extruded materials in the temperature range 600 to 900° C leads to a cellular decomposition of the high temperature β structure into two isostructural phases, one niobium-rich (βNb) and the other zirconium rich (βZr), with an accompanying increase in critical current (at an average field of 20 kOe) up to twelve times the original value. Heat treatment of quenched tubes at 800 or 900° C produces precipitation on sub-boundaries prior to the cellular reaction, this being accompanied by an increase in critical current to at least thirteen times the original value. In this case, however, prolonged heating leads to a fall in critical current which it is suggested is an “overageing” effect.

Keywords

Polymer Precipitation Zirconium Heat Treatment Critical Current 
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.

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Copyright information

© Chapman and Hall 1969

Authors and Affiliations

  • G. W. J. Waldron
    • 1
  1. 1.Central Research Laboratories, Hirst Research CentreThe General Electric Company LimitedWembleyUK

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