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Effects of Rolling Passes on the Transport Properties of 37-Filamentary AgAu-Sheathed Bi-2223 Tapes

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Abstract

Thirty-seven-filamentary AgAu-sheathed Bi-2223 tapes were fabricated by a powder-in-tube (PIT) process. And, the round wires (ϕ 1.86 mm) were rolled to 0.35-mm tapes with 12, 7, 5, and 4 rolling passes through flat rolling, respectively. The influences of different rolling passes on the core density, deformation, and transport properties of Bi-2223/AgAu tapes were systematically investigated. It was noticed that after rolling, the Vickers microhardness of the superconducting core and deform homogeneity along both the horizontal and vertical directions on the cross section of seven-pass rolled tape were better than those on the tapes with other passes, which proved the larger core density and uniform deformation with the seven-pass rolling process. Meanwhile for the wires with 12 and 7 passes, the AgAu/superconducting core interfaces were much flatter. With the rolling passes decreasing from 12 to 4, the critical current density (Jc) first increased and then decreased. Due to the better homogeneity and flatter interfaces, Jc reached the maximum value of 17.3 kA/cm2 on the seven-pass sample. Meanwhile, the enhancement of current capacities in magnetic field applied parallel to the Bi-2223/AgAu tape surface could also be recognized as the evidence of improving intergrain connections due to the higher density in seven-pass rolled tapes.

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Funding

This study was financially supported by the National Key Project of Magneto-Constrained Fusion Energy Development Program under Grant 2015GB115001.

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Authors and Affiliations

  1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, **’an, 710072, China

    **aobo Ma, **shan Li & **xiang Zhang

  2. Northwest Institute for Non-Ferrous Metal Research (NIN), **’an, 710016, China

    **aobo Ma, Shengnan Zhang, Zeming Yu, Guoqing Liu, Huiling Zheng, Chengshan Li & **xiang Zhang

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  1. **aobo Ma
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  2. Shengnan Zhang
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  3. Zeming Yu
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  7. **shan Li
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Correspondence to Shengnan Zhang.

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Ma, X., Zhang, S., Yu, Z. et al. Effects of Rolling Passes on the Transport Properties of 37-Filamentary AgAu-Sheathed Bi-2223 Tapes. J Supercond Nov Magn 31, 3105–3110 (2018). https://doi.org/10.1007/s10948-018-4572-4

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  • DOI: https://doi.org/10.1007/s10948-018-4572-4

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