Phase Evolution and Area Fractions of Coarse-Grain and Fine-Grain A15 in APC Nb3Sn Superconductors

IF 1.7 3区物理与天体物理 Q3 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Applied Superconductivity Pub Date : 2024-12-09 DOI:10.1109/TASC.2024.3513941

Fang Wan;Xingchen Xu;Xuan Peng;Michael. D. Sumption

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引用次数: 0

Abstract

Previous studies have shown that APC Nb ₃ Sn strands based on the internal oxidation of Nb-Ta-Zr or Nb-Ta-Hf alloys had higher non-Cu critical current density ( J_c s) than the state-of-the-art strands at high fields (e.g., ≥ 12 T) while having lower non-Cu J_c s at low fields (e.g., ≤ 5 T), which helps to reduce the undesired persistent-current magnetization. Moreover, APC strands reacted at lower temperature tend to have flatter J_c ( B ) curves, possibly allowing the targeting of even better J_c performance at high fields, while at the same time suppressing J_c s at low fields. However, it is required that APC strands attain large fine-grain (FG) area fractions and suppressed coarse-grain (CG) area fractions at low reaction temperature. In this work, the influence of reaction temperature on the evolution of FG and CG Nb ₃ Sn phases in APC Nb ₃ Sn strands was investigated. Our goal is to find more effective methods to increase the FG area fraction as well as the overall performance of APC strands.

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来源期刊

IEEE Transactions on Applied Superconductivity 工程技术-工程：电子与电气

CiteScore

3.50

自引率

33.30%

发文量

650

审稿时长

2.3 months

期刊介绍： IEEE Transactions on Applied Superconductivity (TAS) contains articles on the applications of superconductivity and other relevant technology. Electronic applications include analog and digital circuits employing thin films and active devices such as Josephson junctions. Large scale applications include magnets for power applications such as motors and generators, for magnetic resonance, for accelerators, and cable applications such as power transmission.