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The Reaction Process of NbAl Interface in Rod-in-Tube Strands

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Abstract

We investigated the reaction process of NbAl in samples prepared by the rod-in-tube method. Precursor strands were isothermally heat-treated at a very wide temperature range from 800 to 1,400 °C for 48 h. As a result, we obtained NbAl3 and NbAl diffusion layers below 1,000 °C; NbAl3 and Nb2Al at 1,000 to 1,200 °C; and NbAl3, Nb2Al, and a small amount of nonstoichiometric Nb3Al at 1,400 °C. Diffusion or reaction layers were observed clearly by scanning electron microscope for all of the samples mentioned above. Furthermore, nonstoichiometric Nb3Al phase can be found only at 1,400 °C through a higher resolution. Additionally, magnetic measurement results also show that the superconducting transition temperature is about 14.8 K only for the sample obtained at 1,400 °C for 48 h.

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Acknowledgments

The authors are grateful for the financial support of the National Magnetic Confinement Fusion Science Program (Grant No. 2011GB112001), Program of International S&T Cooperation (Grant No. 2013DFA51050), the National Natural Science Foundation of China (Grant Nos. 11104224, 51377138, and 51302224), the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20110184120029). Yongliang Chen is also grateful for the financial support of Li Jinsheng Scholarship of Superconductivity and New Energy R&D Center.

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Authors and Affiliations

  1. Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education of China), Superconductivity and New Energy R&D Center, Mail Stop 165#, Southwest Jiaotong University, Chengdu, Sichuan, 610031, China

    Lupeng Du, Pingyuan Li, Zhao Liu, Yajing Cui, Yongliang Chen & Yong Zhao

  2. School of Materials Science and Engineering, University of New South Wales, Sydney, 2052 NSW, Australia

    Yong Zhao

  3. Western Superconducting Technologies (WST) Co., Ltd.,, Xi’an, 710018, China

    Xifeng Pan & Guo Yan

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  1. Lupeng Du
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  2. Pingyuan Li
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  3. Zhao Liu
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  4. Yajing Cui
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  5. Yongliang Chen
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Correspondence to Yongliang Chen.

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Du, L., Li, P., Liu, Z. et al. The Reaction Process of NbAl Interface in Rod-in-Tube Strands. J Supercond Nov Magn 27, 2029–2033 (2014). https://doi.org/10.1007/s10948-014-2577-1

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  • DOI: https://doi.org/10.1007/s10948-014-2577-1

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