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Determination of α-(Cu, Sn) in bronze area in fabrication of Nb3Sn superconductor
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2024-12-20 , DOI: 10.1016/j.jallcom.2024.178231 Zerong Zhang, Zhan Gao, Yanan Wang, Junsheng Cheng, Qiuliang Wang
Journal of Alloys and Compounds ( IF 5.8 ) Pub Date : 2024-12-20 , DOI: 10.1016/j.jallcom.2024.178231 Zerong Zhang, Zhan Gao, Yanan Wang, Junsheng Cheng, Qiuliang Wang
With the advancement in superconducting magnet technology, Nb3Sn has emerged as the preferred choice for applications requiring high magnetic field. Moreover, Cu-Sn alloy is thought to be the primary material used to prepare Nb3Sn superconductor. And Sn chemical potential (or Sn activity) could significantly affect the formation and the microstructure of Nb3Sn superconductor. However, insufficient studies were conducted thus far on solid-state reactions and phase transformation in the bronze area, making it challenging to systematically analyze the influence of Sn activity on the preparation of Nb3Sn. Therefore, in this work, Nb3Sn superconductors and Cu-Sn alloys were simultaneously prepared by powder metallurgy method. In addition, the phase constitutes and microstructures in bronze area, as well as the superconducting properties of Nb3Sn superconductors, were thoroughly investigated. The results indicated that α-(Cu, Sn) solid solution could be formed during heat treatment in both of the Nb-Sn-Cu and Cu-Sn samples. Furthermore, with the same composition ratio of Sn to Cu in the precursors, the α-(Cu, Sn) solid solution in Nb-Sn-Cu samples possessed a lower Sn content than that the Cu-Sn samples because part of Sn was consumed in the reaction with Nb. Additionally, among the Nb-Sn-Cu samples, the sample with the composition of Nb:Sn:Cu = 3:1:9.5 at.% exhibited the thickest Nb3Sn layer and the best superconducting performance due to the highest Sn activity in bronze area.
更新日期：2024-12-20
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