Nausite and NbSn2 – Growth and distinction of structural related intermetallic phases in the Cu–Nb–Sn system

Lachmann, Jonas; Huber, Nicolas; Leineweber, Andreas

doi:10.1016/j.matchar.2020.110563

Cited by 5 publications

(3 citation statements)

References 22 publications

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“…Large grains also occur at the interface between bronze and the Nb 3 Sn layer in post-reacted samples, figure 3(b), and these grains grow into the bronze. EDS indicates that this is a Cu-Sn-Nb compound like that found in some Nb 3 Sn wires [32,33]. Cracks are not evident in surface or cross-section images.…”

Section: Xrd Analysismentioning

confidence: 73%

Rapid Nb₃Sn film growth by sputtering Nb on hot bronze

Withanage

Juliao

Cooley

2021

Supercond. Sci. Technol.

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Nb deposited by magnetron sputtering onto hot Cu-15 wt.%Sn bronze substrates at temperatures above 700 °C achieved Nb3Sn film growth at a rate of 33 nm min−1, which was an order of magnitude faster than that achieved for deposition of Nb on bronze at low temperature followed by in situ post reaction at the same high temperatures. Tin content in the Nb3Sn films made on hot bronze was ∼26.3%, which is significantly higher than ∼24.5% obtained by post-reaction as well as for typical bulk reactions between Nb and α-bronze. The Nb3Sn lattice parameter was consistent with measured tin content and predicted elastic strain for both routes. Critical temperatures of 14 K–16 K, instead of 18 K, were consistent with elastic strain due to coefficient of thermal expansion mismatch between the Nb3Sn and bronze substrate and, for the hot-bronze samples, stress related to the growth mechanism. Films were fully coalesced and had surface roughness values <20 nm over a 100 μm2 scan. Grain structure of the Nb3Sn films produced by Nb sputtering on hot bronze resembles zone 2 in the Thornton structure-zone diagram, in contrast to the equiaxed grain structure reminiscent of microstructure observed in reacted Nb3Sn wires exhibited by the post-reaction route.

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Section: Xrd Analysismentioning

confidence: 73%

Rapid Nb₃Sn film growth by sputtering Nb on hot bronze

Withanage

Juliao

Cooley

2021

Supercond. Sci. Technol.

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“…Many samples contained both NbSn2 and nausite, which are very closely related, and indeed are challenging to distinguish. A detailed analysis of the structural relationships between the phases has recently been published [8]. Having resolved them in both PVD and powder samples, the composition and lattice parameters of each phase were obtained from EDX and XRD, and the mean atomic volume calculated.…”

Section: Evaluation Of Cu-nb-sn Phase Equilibriamentioning

confidence: 99%

“…In parallel, a collaborative project with TU Bergakademie Freiberg is seeking to better understand the Cu-Nb-Sn system and its interactions with dopants, alloying elements and internal oxidation designs. A detailed study of the relationship between NbSn2 and nausite has recently been published [8], and a re-evaluation of the Cu-Nb-Sn phase diagram is in preparation. In this article, initial findings of this study are reported, including the stability range of nausite and isothermal sections of the ternary phase diagram.…”

Section: Introductionmentioning

confidence: 99%

Phase Evolution During Heat Treatment of Nb₃Sn Wires Under Development for the FCC Study

Hopkins

Baškys

Ballarino

et al. 2021

IEEE Trans. Appl. Supercond.

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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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Thermodynamic re-modelling of the Cu–Nb–Sn system: Integrating the nausite phase

Lachmann

Kriegel

Leineweber

et al. 2022

Calphad

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Nausite and NbSn2 – Growth and distinction of structural related intermetallic phases in the Cu–Nb–Sn system

Cited by 5 publications

References 22 publications

Rapid Nb₃Sn film growth by sputtering Nb on hot bronze

Rapid Nb₃Sn film growth by sputtering Nb on hot bronze

Phase Evolution During Heat Treatment of Nb₃Sn Wires Under Development for the FCC Study

Thermodynamic re-modelling of the Cu–Nb–Sn system: Integrating the nausite phase

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Nausite and NbSn2 – Growth and distinction of structural related intermetallic phases in the Cu–Nb–Sn system

Cited by 5 publications

References 22 publications

Rapid Nb3Sn film growth by sputtering Nb on hot bronze

Rapid Nb3Sn film growth by sputtering Nb on hot bronze

Phase Evolution During Heat Treatment of Nb3Sn Wires Under Development for the FCC Study

Thermodynamic re-modelling of the Cu–Nb–Sn system: Integrating the nausite phase

Contact Info

Product

Resources

About

Rapid Nb₃Sn film growth by sputtering Nb on hot bronze

Rapid Nb₃Sn film growth by sputtering Nb on hot bronze

Phase Evolution During Heat Treatment of Nb₃Sn Wires Under Development for the FCC Study