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Structure and High-Field Performance of New {\hbox {Nb}}_{3}{\hbox {Sn}} Wires Fabricated From Sn-Based Alloys

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6 Author(s)
Tachikawa, K. ; Fac. of Eng., Tokai Univ., Hiratsuka, Japan ; Hayashi, Y. ; Nakata, K. ; Sasaki, H.
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Sn-Ta based quaternary alloys were prepared by the reaction of constituent metal powders. The alloys were fabricated into sheet or rod forms. In addition, Sn-Ti based ternary alloys prepared by melt and cast procedure were fabricated into sheets. Jelly Roll (JR) composites were prepared using Sn-based alloy sheet and Nb sheet, and then fabricated into wires. A Bc2 (4.2 K) of 26.9 T (mid) has been obtained in the JR wire using Sn-Ta based alloy sheet. Thick Nb3Sn layers were formed by the mutual diffusion between Sn-based alloy sheet and Nb sheet. Stoichiometric Sn concentration with no gradient was obtained throughout the Nb3Sn layers, which may be the main origin of excellent high-field performance of the JR wires. Meanwhile, 19 and 37 filamentary Nb3Sn wires have been fabricated using Sn-Ta based alloy rods. An equivalent high-field performance has been obtained in the multi-rod wires as that of JR wires.

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Applied Superconductivity, IEEE Transactions on  (Volume:19 ,  Issue: 3 )