Evolution of the pinning force of NbTi filaments as a function of isothermal annealing time

Chiarasole Fiamozzi Zignani, Gianluca De Marzi, Luigi Muzzi, Jukka Somerkoski

Research output: Contribution to conferencePaper

2 Citations (Scopus)

Abstract

A cold worked multifilamentary Cu/Nb-47w%Ti wire was annealed at a temperature of 375°C for various times from 2 minutes up to 100 hours. Filaments were extracted from copper matrix by etching. With the attempt to improve understanding of superconducting properties, extracted filaments were tested with a Vibrating Sample Magnetometer (VSM) as a function of field over a wide temperature range. The Ic curves were obtained from the magnetization cycles at different temperatures, and the normalized pinning forces (fp) were plotted as a function of the reduced applied field (b). For each sample, it was found that the fp peak clearly shifts to lower fields as the temperature approaches Tc. Further, the pinning curves also depended on the annealing time. The fp vs. b curves were reproduced with the 2-components model which recently has been developed and successfully validated on a number of optimized NbTi commercial strands. Results are discussed in terms of current pinning models, also in comparison with results of microstructural characterization.
Original languageEnglish
DOIs
Publication statusPublished - 2012
Externally publishedYes
EventSuperconductivity Centennial Conference, SCC 2011 - The Hague, Netherlands
Duration: 1 Jan 2012 → …

Conference

ConferenceSuperconductivity Centennial Conference, SCC 2011
CountryNetherlands
CityThe Hague
Period1/1/12 → …

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All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Zignani, C. F., De Marzi, G., Muzzi, L., & Somerkoski, J. (2012). Evolution of the pinning force of NbTi filaments as a function of isothermal annealing time. Paper presented at Superconductivity Centennial Conference, SCC 2011, The Hague, Netherlands. https://doi.org/10.1016/j.phpro.2012.06.051