Status and perspective of the Nb3Al development |
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| Authors: | T Takeuchi A Kikuchi N Banno H Kitaguchi Y Iijima K Tagawa K Nakagawa K Tsuchiya C Mitsuda N Koizumi K Okuno |
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| Affiliation: | 1. Department of Materials Engineering, Indian Institute of Science, Bangalore 560012, India;2. Department of Materials, University of Oxford, Oxford OX1 3PH, United Kingdom;3. Max-Planck-Institut für Eisenforschung GmbH, 40237 Düsseldorf, Germany;4. Institute of Materials Physics, University of Münster, 48149, Germany;1. National Institute for Materials Science, Tsukuba 305-0047, Japan;2. Department of Engineering and Applied Science, Sophia University, Tokyo 102-8554, Japan |
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| Abstract: | Nb3Al has advantages of better tolerance to strain/stress and a higher critical magnetic field (30 T at 4.2 K) for stoichiometric composition over Nb3Sn. The rapid-heating, quenching and transformation annealing (RHQT) process enables to form a stoichiometric Nb3Al with fine grain structures via metastable bcc supersaturated-solid-solution. As a result a large critical current density of Nb3Al is achieved over the whole range of magnetic fields without trading off the excellent strain tolerance. A long-length of RHQ processing has been established, and a rectangular but Cu stabilized Nb3Al strand is about be commercially available for NMR uses. Ag or Cu internal stabilization and Cu ion-plating/electroplating techniques have been also developed to enable the stabilized round wire for accelerator and fusion magnets. Successfully energized test coils that were manufactured with a wind-and-react technique have demonstrated that a long piece of Cu stabilized RHQT Nb3Al wire is really available for practical applications. |
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