Electromechanical properties of superconducting MgB2 wire

K. Salama, Y. X. Zhou, M. Hanna, M. Alessandrini, P. T. Putman, H. Fang

Research output: Contribution to journalArticlepeer-review

12 Scopus citations

Abstract

The current-carrying capability of superconducting wires is degraded by stress. Therefore electromechanical properties are one of the key feedback parameters needed for progress in conductor applications. In this work, uniaxial tensile stresses and bending stresses were applied to Fe /MgB2 wires at room temperature, followed by measurement of critical current using a transport method at 4.2 K. Basic mechanical properties were calculated from the measured stress-strain characteristics. The irreversible tensile strain at which the critical current density of MgB2 wire starts to degrade was found to be 0.5%. In addition, the degradation of Ic with decreasing bending diameters was found to be very rapid for wires that were deformed after the heat treatment that forms the MgB2 compound, while not much degradation of Ic was found for wires that were bent before being annealed. SEM observations confirmed that cracks could be healed by post-annealing.

Original languageEnglish (US)
Pages (from-to)S369-S372
JournalSuperconductor Science and Technology
Volume18
Issue number12
DOIs
StatePublished - Dec 1 2005

ASJC Scopus subject areas

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

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