Preparation of Nb3Al superconductor by powder metallurgy and effect of mechanical alloying on the phase formation

作     者：Zhao Liu Yongliang Chen Lupeng Du Pingyuan Li Yajing Cui Xifeng Pan Guo Yan 

作者机构：Key Laboratory of Magnetic Levitation Technologies and Maglev TrainsMinistry of Education of Chinaand Superconductivity and New Energy R&D CenterSouthwest Jiaotong University Western Superconducting Technologies Co.Ltd. 

出 版 物：《Journal of Modern Transportation》 (现代交通学报（英文版）)

年 卷 期：2014年第22卷第1期

页      面：55-58页

学科分类：0808[工学-电气工程] 0809[工学-电子科学与技术（可授工学、理学学位）] 07[理学] 070205[理学-凝聚态物理] 08[工学] 1201[管理学-管理科学与工程(可授管理学、工学学位)] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0802[工学-机械工程] 0814[工学-土木工程] 0812[工学-计算机科学与技术（可授工学、理学学位）] 0823[工学-交通运输工程] 0801[工学-力学（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：supported by the National Magnetic Confinement Fusion Science Program (Grant No. 2011 GB112001) the Program of International S&T Cooperation (Grant No. 2013DFA51050) the National Natural Science Foundation of China (Grant Nos. 11104224, 11004162, 51377138, and 51302224) the Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20110184120029) the Fundamental Research Funds for the Central Universities (Grant Nos. 2682013ZT16, SWJTU11ZT31, 2682013CX004, and SWJTU11BR063) the Science Foundation of Sichuan Province (Grant Nos. 2011JY0031 and 2011JY0130) 

主　　题：Nb3Al Superconductivity Powdermetallurgy Mechanical alloying 

摘      要：Adoption of powder-in-tube method to fabricatesuperconducting wire can realize a large application ofNb3Al prepared by powder metallurgy. Powder metallurgywas used to synthesize Nb3Al under various heat-treatmentconditions, annealing temperature was varied from 700 to1,000 C and heating time was varied from 10 to 50 h.X-ray diffraction patterns reveal that a reaction between Nband Al took place and formed NbAl3 phase. Under currentheat-treatment conditions （annealing temperature wasvaried from 700 to 1,000 C and heating time was variedfrom 10 to 50 h）, NbAl3 was so stable that it did not furtherreact with the unreacted Nb and was not sensitive to theheat-treatment condition. By mechanical alloying, adoptionof high-energy ball milling significantly decreases particlesize and enhances surface free energy, which promotes theformation of Nb3Al phase. X-ray diffraction patternsindicate that relatively pure Nb3Al phase was obtainedunder the same heat-treatment condition. Energy-dispersiveX-ray analysis measurement demonstrates that theobtained samples were close to the right stoichiometry ofA15 structure Nb3Al.