28 June 2015 to 2 July 2015
JW Marriott Starr Pass Resort
Etc/GMT-7 timezone

Shift of the Fp-B curve peak of Nb3Sn conductors with very fine grain sizes

30 Jun 2015, 11:30
Tucson Ballroom AB ()

Tucson Ballroom AB

Contributed Oral Presentation ICMC-01 - NbTi/Nb3Sn/A15 Processing and Properties M2OrA - Superconductor Materials III: Nb3Sn


Xingchen Xu (the Ohio State University)


In an earlier work we demonstrated on a monofilament that the internal oxidation method can significantly refine the grain size and improve the high-field Jc of Nb3Sn strands. In that work we found that as the Nb3Sn grain size was reduced down to 20-50 nm (with an average of 36 nm), the peak of the Fp-B curve shifted from 0.2Birr to 0.34Birr. In this work we further reduce the grain size by using a lower reaction temperature and a higher-Zr Nb-Zr alloy, in order to find out how the Fp-B curve peak shifts as grain size decreases. A pinning theory is also developed to explain the shift of the Fp-B curve peak as grain size is reduced. In this work we also work towards implementing the internal oxidation method in practical multi-filamentary tube type Nb3Sn strands. Schemes to apply this method to rod-restack-process (RRP) and powder-in-tube (PIT) strands are also proposed.

Primary author

Xingchen Xu (the Ohio State University)


Mike Sumption (The Ohio State University) Dr Ted Collings (the Ohio State University) Dr Xuan Peng (Hyper Tech Research Inc.)

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