Maximization of the critical current of practical Nb3Sn wires through complex mechanical treatments at room temperature

P. Badica, H. Oguro, S. Awaji, G. Nishijima, K. Watanabe

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


Relaxation of the thermal residual strain in Nb3Sn wires is realized through cycles of multiple torsion loadings ('pre-torsion') at room temperature. As a consequence, the critical current, Ic, is enhanced. This effect is stronger than previously reported mechanical treatments of multiple bending ('pre-bending'). The maximum Ic is attained for complex mechanical treatments of pre-torsion and pre-bending. Complex treatments allow efficient and relatively independent control of residual strain relaxation over all three directions of the wire, resulting in enhancement of Ic towards the theoretical limit of the material. Our findings have an immediate positive impact on the performance of Nb3Sn wires and, hence, on their applications (e.g.react-and-wind coils).

Original languageEnglish
Article number015
Pages (from-to)810-813
Number of pages4
JournalSuperconductor Science and Technology
Issue number8
Publication statusPublished - 2007 Aug 1

ASJC Scopus subject areas

  • Ceramics and Composites
  • Condensed Matter Physics
  • Metals and Alloys
  • Electrical and Electronic Engineering
  • Materials Chemistry


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