Journal of Materials Science

, Volume 28, Issue 4, pp 942–948 | Cite as

Microstructural observation of Nb3Al multifilamentary superconducting wires

  • Akira Hasegawa
  • Takao Takeuchi
  • Kiyoshi Inoue


A sample preparation technique is developed for the transversal observation of Nb tube processed multifilamentary wire. Microstructure characterization of the cross-section of Nb-25 at % (Al-2 at % Cu) wire has been carried out with analytical transmission electron microscopy. Intermetallic compound phases of A15, σ and NbAl3 are observed in a specimen heat-treated at 1023 K. Volume fraction changes of the individual phases indicate that σ and NbAl3 phases formed at the prior Al-core region in the early stage of the heat treatment, and thereafter A15 phase particles grew and coalesced with each other, consuming Nb and σ phase. A change in the volume fraction of A15 phase is correlated with superconducting properties.


Intermetallic Compound Phase Particle Microstructure Characterization Analytical Transmission Electron Microscopy Microstructural Observation 
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Copyright information

© Chapman & Hall 1993

Authors and Affiliations

  • Akira Hasegawa
    • 1
  • Takao Takeuchi
    • 1
  • Kiyoshi Inoue
    • 1
  1. 1.Tsukuba LaboratoriesNational Research Institute for MetalsIbarakiJapan

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