Journal
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
Volume 31, Issue 5, Pages -Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TASC.2021.3063675
Keywords
Heat treatment; Intermetallic; Microstructure; Multifilamentary superconductors; Niobium-tin
Funding
- CERN [KE3985]
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This study summarizes the phase transformations in the Cu-Nb-Sn system, analyzing the phase transformations during low-temperature heat treatment of wires, and presents selected isothermal sections of the re-evaluated phase diagram.
In recent years, the phase formation sequence during heat treatment of Nb3Sn wires, and the influence of the microstructure and compositional homogeneity of Nb3Sn on in-field critical current (I-c), have received increasing attention. For RRP wires, the importance of understanding and managing the formation of the ternary phase nausite has been demonstrated. However, a published Cu-Nb-Sn phase diagram including this phase is still not available; and conductor development for the Future Circular Collider (FCC) study has introduced a variety of less-studied internal tin wire layouts. In this article, a study of phase transformations in the ternary Cu-Nb-Sn system is summarized, and selected isothermal sections of the re-evaluated phase diagram are presented. The phase transformations during low-temperature heat treatment steps of wires developed for the FCC study are also presented and analyzed in comparison to established RRP conductors.
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