Improvement of mechanical and superconducting properties in CuNb/(Nb,Ti)3Sn wires by applying bending strain at room temperature

Satoshi Awaji, Kazuo Watanabe, Kazumune Katagiri

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)

Abstract

The improvement of stress/strain properties has been observed for the CuNb/(Nb,Ti)3Sn coil made by a react and wind (R&W) method. In the winding and insulation processes, a certain bending strain is applied to the wire and then released at room temperature, which is defined as 'pre-bending' treatment. In order to understand this behaviour, we examine the influences of bending strain at room temperature on the mechanical and superconducting properties in (Nb,Ti)3Sn composite wire. Experimental results for the pre-bent CuNb/(Nb,Ti)3Sn wires show the improvement of the stress dependence of Ic/Icm and the increase of the critical current Ic at zero stress. The calculation on the basis of the distribution of the uniaxial local stress/strain describes the experimental results, qualitatively. We have found that the improvement of the critical current and the mechanical properties is due to the local work hardening effects by applying the bending strain at room temperature.

Original languageEnglish
Pages (from-to)733-738
Number of pages6
JournalSuperconductor Science and Technology
Volume16
Issue number6
DOIs
Publication statusPublished - 2003 Jun 1

ASJC Scopus subject areas

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

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