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《Chinese Science Bulletin》 2014-22
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Fabrication and properties of rod-in tube Nb_3Al superconducting wires for high-field magnets application

PAN XiFeng;YAN Guo;CHEN Chuan;QI Ming;CUI LiJun;CHEN YongLiang;ZHAO Yong;BAI ZhiMing;LI ChengShan;LIU XiangHong;FENG Yong;ZHANG PingXiang;National Engineering Laboratory for Superconducting Materials, Western Superconducting Technologies Co. Ltd.;Department of Physics,Northeast Univeristy;Superconducting Materials Center, Northwest Institutes for Nonferrous Metal Research;Key Laboratory of Magnetic Levitation Technologies and Maglev Trains (Ministry of Education of China), Superconductivity and New Energy R&D Center, Southwest Jiaotong University;  
In this work, rod-in-tube(RIT) method was utilized to make the Nb3 Al precursor long wires, combing with hot-extrution, drawing and rolling process, and consequently high-performance Nb3 Al superconducting wires had been made, which stood up a rapid heating, quenching(RHQ) and low-temperature annealing process by using the home-made RHQ equipment up to 2000°C. The results suggest the Nb3 Al superconducting wires compose with tubular Nb3 Al superconductors, Nb-matrix and holes. By RHQ heat-treatment, Al cores dissolved into the Nb-matrix, reacted with the near Nb layer, and left the holes. After low-temperature annealing, the Nb-Al solid-solution was changed into tubular Nb3 Al superconductor, and un-reacted Nb, far from the Al source, was the Nb-matrix. The SEM and magnetization susceptibility measurements present these Nb3 Al superconductors are with fine grains of 50–100 nm, and well grains-connectivity. All of the onset superconducting transition temperature Tc reach about 17 K, which imply they have Nb/Al atom ratio of 3:1. Therefore, using the RIT Nb/Al precursor wires and RHQ heat-treatment is promising to develop the next-generation high-performance Nb3 Al superconducting wires for high-field magnet application.
【Fund】: 国家自然科学基金(51302224 51377138和11104224);; 国家磁约束核聚变能研究专项(2011GB112001)资助
【CateGory Index】: TM26
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