Effect of Intermediate Heat Treatment on the Formation and Structure of Superconducting Layers in Multifilamentary Nb₃Sn- Based Wires

Abstract:

In the present study, the Nb₃Sn-based multifilamentary wires with coupled Nb filaments have been investigated by SEM and TEM after various regimes of intermediate annealing including short high-temperature heat treatments and after two-staged diffusion annealing. The formation of some amount of pre-reacted Nb₃Sn layers has been revealed in all the wires studied, and their amount depends on the wire diameter, temperature and duration of the intermediate heat treatment. The structure of final diffusion layers is also affected by the regimes of these preliminary treatments. This research enables the revealing of the optimal heat treatment schedules for the formation of most perfect nanocrystalline structure of superconducting layers ensuring the highest critical current densities.

• Periodical: Defect and Diffusion Forum (Volume 391)
• Pages: 239-245
• DOI: https://doi.org/10.4028/www.scientific.net/DDF.391.239
• Online since: February 2019
• Authors: E.N. Popova, I.L. Deryagina, E.G. Valova-Zaharevskaya
• Keywords: Bronze Technology, Diffusion Annealing, Intermediate Heat Treatment, Nanocrystalline Structure, Nb₃Sn, Superconducting Composite

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