Stabilization and coil performance of RHQT-processed Nb/sub 3/Al conductors

Takeuchi, T.; Banno, N.; Fukuzaki, T.; Toko, Kiyoshi; Matsumoto, Shinji; Wada, Hitoshi; Aihara, Katsuzo; Wadayama, Yoshihide; Okada, Minoru; Tagawa, K.; Nakagawa, Kazuma

doi:10.1109/77.919952

Cited by 23 publications

(25 citation statements)

References 8 publications

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“…It has been reported that when a RHQ treatment is applied to Nb and Al raw materials, a solid solution of NbAl y with a bcc structure is formed [6][7][8][9][10][11][12]. Upon further heat treatment, this undergoes an A15 phase transformation to form Nb 3 Al.…”

Section: Introductionmentioning

confidence: 97%

Observation of A15 phase transformation in RHQ-Nb3Al wire by neutron diffraction at high-temperature

Jin

Nakamoto

Harjo

et al. 2012

Journal of Alloys and Compounds

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Section: Introductionmentioning

confidence: 97%

Observation of A15 phase transformation in RHQ-Nb3Al wire by neutron diffraction at high-temperature

Jin

Nakamoto

Harjo

et al. 2012

Journal of Alloys and Compounds

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“…The rectangular strand got about 1.5-2 times as high as core of the 1.35 mm strand in field more than 22 T. The RHQ operation of a rectangular strand might have an effect on an enhancement of core . Application of Cu cladding [8], and internal stabilization [9] techniques and a deformation process to enhance after RHQ operation [8] has not yet been investigated, but all of them will be needed for practical use in a magnet coil in future.…”

Section: Phases Formed In As-rhqed Strandsmentioning

confidence: 98%

Attempts to Enhance a Current Capacity by a RHQ Operation of Nb/Al Rectangular Strand

Tatsumi

Takeuchi

Iijima

et al. 2004

IEEE Trans. Appl. Supercond.

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We tried to enlarge a Nb/Al strand dimension to enhance a current capacity of RHQT-Nb 3 Al further. So far good fsRHQ operation could be made by using the strand dimension of less than 1.35 mm. This time we tried to make RHQ operation by using a Nb/Al rectangular strand of 1 45 2 2 mm 2 which is double cross-section area of 1.35 mm. Bcc phases could be formed even in the large cross-section rectangular strand by RHQ operation. The samples were post-annealed at 800 C for transforming into A15. The resultant I and core J were 232.5 A and 130 A/mm 2 at 4.2 K, 22 T, respectively. These values largely surpassed I of 57.5 A and J of 72.7 A/mm 2 at 4.2 K, 22 T for the sample which was made by using a conventional 1.35 mm strand.Index Terms-High current capacity, large cross-sectional rectangular strand, Nb 3 Al superconductor, rapid-heating quenching and transformation (RHQT).

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“…Their high-field performance and strain tolerance are superior to those of Nb 3 Sn conductors [6]. Nb 3 Al coil wound with an externally copper-stabilized conductor succeeded in generating 1:3 T in a back up field of 21:2 T of the high-field superconducting magnet using Bi-2212 inner coil [7]. …”

Section: High-field Superconducting Magnetmentioning

confidence: 98%