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Superconducting properties of titanium alloys (Ti-64 and Ti-6242) for critical current barrels.

Ridgeon, F.J. and Raine, M.J. and Halliday, D.P. and Lakrimi, M. and Thomas, A. and Hampshire, D.P. (2017) 'Superconducting properties of titanium alloys (Ti-64 and Ti-6242) for critical current barrels.', IEEE transactions on applied superconductivity., 27 (4). p. 4201205.


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.

Item Type:Article
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Publisher statement:© 2016 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
Date accepted:17 November 2016
Date deposited:22 November 2016
Date of first online publication:26 December 2016
Date first made open access:22 November 2016

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