The microstructure of NbTi superconducting composite wire for ITER project

J. F. Li, P. X. Zhang, X. H. Liu, J. S. Li, Y. Feng, S. J. Du, T. C. Wang, W. T. Liu, G. Grunblatt, C. Verwaerde, G. K. Hoang

Research output: Contribution to journalArticlepeer-review

27 Scopus citations

Abstract

This paper presents early results of the R&D programme carried out to optimize NbTi wires for the ITER poloidal field coils (PF). Using TEM, the influence of treatment conditions on the microstructure was investigated. The purpose is to find relations between the alloy microstructure and the NbTi wire critical current densities at 4.2 K. Typical NbTi with high critical current density at 4.2 K shows a microstructure (in transverse cross-section) with strongly folded and curled of α-Ti pinning centers dispersed within the superconducting β-NbTi matrix. It is believed that the higher temperature is beneficial to a higher 4.2 K Jc values, but these Jc values slightly decrease with increasing heat treatment durations.

Original languageEnglish
Pages (from-to)1840-1842
Number of pages3
JournalPhysica C: Superconductivity and its Applications
Volume468
Issue number15-20
DOIs
StatePublished - 15 Sep 2008

Keywords

  • Critical current density
  • ITER
  • Microstructure
  • NbTi superconducting wire

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