Determination of α-(Cu, Sn) in bronze area in fabrication of Nb3Sn superconductor

IF 5.8 2区 材料科学 Q2 CHEMISTRY, PHYSICAL
Zerong Zhang, Zhan Gao, Yanan Wang, Junsheng Cheng, Qiuliang Wang
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Abstract

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.
Nb3Sn超导体制备中青铜区α-(Cu, Sn)的测定
随着超导磁体技术的发展,Nb3Sn 已成为需要高磁场应用的首选。此外,Cu-Sn 合金被认为是制备 Nb3Sn 超导体的主要材料。而锡的化学势(或锡活性)会显著影响 Nb3Sn 超导体的形成和微观结构。然而,迄今为止,青铜领域对固态反应和相变的研究还不够充分,因此系统分析 Sn 活性对制备 Nb3Sn 的影响具有挑战性。因此,本研究采用粉末冶金法同时制备了 Nb3Sn 超导材料和铜锡合金。此外,还深入研究了青铜区的相构成和微观结构,以及 Nb3Sn 超导材料的超导特性。结果表明,铌-锡-铜和铜-锡样品在热处理过程中都能形成α-(铜,锡)固溶体。此外,在前驱体中锡与铜的成分比相同的情况下,铌锡铜样品中的α-(铜,锡)固溶体的锡含量低于铜锡样品,这是因为部分锡在与铌的反应中被消耗掉了。此外,在 Nb-Sn-Cu 样品中,Nb:Sn:Cu = 3:1:9.5 at.% 组成的样品由于青铜区域的 Sn 活性最高,因此 Nb3Sn 层最厚,超导性能最好。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Journal of Alloys and Compounds
Journal of Alloys and Compounds 工程技术-材料科学:综合
CiteScore
11.10
自引率
14.50%
发文量
5146
审稿时长
67 days
期刊介绍: The Journal of Alloys and Compounds is intended to serve as an international medium for the publication of work on solid materials comprising compounds as well as alloys. Its great strength lies in the diversity of discipline which it encompasses, drawing together results from materials science, solid-state chemistry and physics.
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