Strain characteristics of Nb3Sn multifilamentary wires with CuNb reinforcing stabilizer

K. Katagiri, K. Watanabe, K. Noto, K. Goto, T. Saito, O. Kono, A. Iwamoto, M. Nunogaki, T. Okada

Research output: Contribution to journalArticlepeer-review

3 Citations (Scopus)

Abstract

Bronze processed multifilamentary Nb3Sn superconducting wires, with a CuNb reinforcing stabilizer instead of the conventional Cu stabilizer, were fabricated. The mechanical properties and the strain dependence of the critical current Ic were evaluated at 4.2 K and a magnetic field of 15 T. A remarkable increase in the yield stress (70%) and the plastic flow stress as compared to the values for the wire with Cu stabilizer was observed. The strain for the peak Ic was also increased by 0.2%. Ic on unloading was reversible within the strain range of 1.5%. The strain sensitivity of Ic in the CuNb/Nb3Sn wire was almost the same as that of the Cu/Nb3Sn wire. A decrease in the wire diameter from 0.8 to 0.5 mm resulted in a slight increase in the yield stress of the CuNb/Nb3Sn wire, but no change in the strain dependence of Ic. An increase in the heat treatment temperature from 700 to 750°C resulted in a decrease in the flow stress of 15%, but no change in the strain dependence of Ic. A marked change in the morphology of the Nb filament in the CuNb reinforcing stabilizer was evidenced during heat treatment.

Original languageEnglish
Pages (from-to)1039-1043
Number of pages5
JournalCryogenics
Volume34
Issue number12
DOIs
Publication statusPublished - 1994 Dec

Keywords

  • CuNb alloy
  • reinforcing stabilizer
  • strain characteristics
  • superconducting wires

ASJC Scopus subject areas

  • Materials Science(all)
  • Physics and Astronomy(all)

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