Superconducting properties of Nb{sub 3}Al multifilamentary wires fabricated continuously by rapid-quenching
- Tsukuba Magnet Labs., Tsukuba, Ibaraki (Japan)
Recently the authors developed a new fabrication process of Nb{sub 3}Al multifilamentary wire, in which Nb/Al-5at%Mg multifilamentary composite wires were rapidly heated and rapidly quenched to obtain composite wires including many Nb-Al supersaturated bcc filaments. Then the resulting composites were annealed to form Nb{sub 3}Al filaments through the deposition from the metastable Nb-Al bcc filaments. When the Al-5at%Mg alloy core diameters were about 0.6 {mu}m, the wire showed the highest T{sub c} and the highest J{sub c} (20 T, 4.2 K) of 17.4 K and 2.5 x 10{sup 8} A/m{sup 2}, respectively. The optimized J{sub c} values in high fields are much higher than those of the commercially available (Nb,Ti){sub 3}Sn multifilamentary wires. Small mechanical deformation (bending, twisting, and stranding) of the as-quenched composite wires did not degrade the superconducting properties of the final Nb{sub 3}Al multifilamentary wires, which proves the good ductility of the supersaturated bcc filaments. Therefore it should not be difficult to fabricate a large-scaled Nb{sub 3}Al stabilized conductor due to easy handling of as-quenched composite during the fabrication processes, such as Cu-plating, stranding, Cu-housing, and/or encasing into conduit. The final annealing can be performed after these processes. It seems to be possible to make superconducting magnets of this Nb{sub 3}Al wire through the wind & react method. J{sub c} valus of various parts cut from a long wire showed a variation of about {+-}15 %.
- OSTI ID:
- 482164
- Report Number(s):
- CONF-950722--
- Journal Information:
- Advances in Cryogenic Engineering, Journal Name: Advances in Cryogenic Engineering Vol. 42B; ISSN ACYEAC; ISSN 0065-2482
- Country of Publication:
- United States
- Language:
- English
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