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Nb3Al conductor fabricated by DRHQ (Double Rapidly-Heating/Quenching) process

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3 Author(s)
Kikuchi, A. ; Nat. Res. Inst. for Metals, Tsukuba, Japan ; Iijima, Y. ; Inoue, K.

For Nb3Al compound, extremely high temperatures are required to obtain the stoichiometric A15 phase, so that the rapidly-heating/quenching process has been developed. In the process the Nb/Al composite filaments change into Nb-Al supersaturated bcc solid solution filaments with rapid-heating/quenching. The Nb-Al solid solutions are transformed into A15 phases with post-annealing at 800°C, resulting in a 2-5 times higher Jc(4.2 K) than those of commercial (Nb,Ti)3Sn wires. However, the best values of Tc=17.8 K and Hc2=26 T are rather lower than those of stoichiometric Nb3Al, which is due to its off-stoichiometry. Therefore, we tried a 2nd rapid-heating/quenching to the 1st rapidly-heated/quenched wires having Nb-Al solid solution filaments. The phase transformation was performed with the 2nd rapid-heating/quenching, which is a very-short high-temperature (about 1900°C) heat treatment to obtain near-stoichiometric Nb3Al. Without any additional elements, the Nb3Al compounds synthesized by the DRHQ (Double Rapid Heating/Quenching) process show Tc and Hc2(4.2 K) of about 18.4 K and 30 T, respectively. The most interesting result is its excellent J,(4.2 K)-B performance, e.g., 2nd A/mm2 at 25 T, 270 A/mm2 at 24 T and 330 A/mm2 at 23 T

Published in:

Applied Superconductivity, IEEE Transactions on  (Volume:11 ,  Issue: 1 )

Date of Publication:

Mar 2001

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