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Superconducting Properties of Titanium alloys (Ti-64 and Ti-6242) for critical current barrels

Ridgeon, F.J.; Raine, M.J.; Halliday, D.P.; Lakrimi, M.; Thomas, A.; Hampshire, D.P.

Superconducting Properties of Titanium alloys (Ti-64 and Ti-6242) for critical current barrels Thumbnail


Authors

F.J. Ridgeon

M. Lakrimi

A. Thomas



Abstract

We have measured the superconducting properties of the titanium alloy Ti-6Al-4V (Ti-64) as-supplied and following two of the heat treatment schedules used for the Nb3Sn strands in the ITER tokamak. The Ti-64 alloy is the standard choice in the superconducting community for the barrels used to make critical current (IC) measurements in high magnetic fields at cryogenic temperatures. Ti-64, which has a two-phase alpha + beta microstructure and contains vanadium (n.b. TC(V) ~ 5.4 K), is superconducting at 4.2 K in fields up to 3 T. We have also measured Ti-6Al-2Sn-4Zr-2Mo-0.2Si (Ti-6242), which is in the near alpha phase and contains tin (n.b. TC(Sn) ~ 3.7 K). The critical temperature of Ti-6242 is 2.38 K which is lower than the 5.12 K of Ti-64. Hence Ti-6242 is a better choice of barrel material for IC measurements required at 4.2 K in low fields up to 3 T, because it remains in the normal state.

Journal Article Type Article
Acceptance Date Nov 17, 2016
Online Publication Date Dec 26, 2016
Publication Date Jun 1, 2017
Deposit Date Nov 17, 2016
Publicly Available Date Nov 22, 2016
Journal IEEE Transactions on Applied Superconductivity
Print ISSN 1051-8223
Electronic ISSN 1558-2515
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 27
Issue 4
Article Number 4201205
DOI https://doi.org/10.1109/tasc.2016.2645378
Public URL https://durham-repository.worktribe.com/output/1393214

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