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.

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.

Citation

Ridgeon, F., Raine, M., Halliday, D., Lakrimi, M., Thomas, A., & Hampshire, D. (2017). Superconducting Properties of Titanium alloys (Ti-64 and Ti-6242) for critical current barrels. IEEE Transactions on Applied Superconductivity, 27(4), Article 4201205. https://doi.org/10.1109/tasc.2016.2645378

• 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