Prebending effect on three-dimensional strain in CuNb/(Nb,Ti) 3Sn wires under a tensile load

Kohki Takahashi, Hidetoshi Oguro, Satoshi Awaji, Kazuo Watanabe, Stefanus Harjo, Kazuya Aizawa, Shutaro MacHiya, Hiroshi Suzuki, Kozo Osamura

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Internal strains under a tensile load for CuNb/(Nb,Ti) 3Sn wires with and without the prebending treatment were measured directly by neutron diffraction at room temperature and 7 K. The axial residual strains changed by 0.30% at room temperature and by 0.38% at 7 K to the tensile side due to the prebending treatment. The effective Poisson's ratio evaluated from the relationship between axial and lateral strains under an axial stress was about 0.36 at 7K with or without the prebending treatment. The applied tensile strain dependences of the deviatoric and hydrostatic strains were estimated, and the tensile strain dependence of the superconducting properties were discussed on the basis of the three-dimensional strain model. A control of the residual strains such as the prebending treatment plays an important role in the superconducting properties of Nb 3Sn wires under axial stress/strain.

Original languageEnglish
Article number6000204
JournalIEEE Transactions on Applied Superconductivity
Volume22
Issue number3
DOIs
Publication statusPublished - 2012 Jun 25

Keywords

  • Bronze route Nb Sn wire
  • neutron diffraction
  • residual strain
  • three-dimensional strain

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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