@article{Scheuerlein2020-03-01Effec-50549,
  year={2020},
  doi={10.1088/1361-6668/ab627c},
  title={Effect of the fabrication route on the phase and volume changes during the reaction heat treatment of Nb<sub>3</sub>Sn superconducting wires},
  number={3},
  volume={33},
  issn={0953-2048},
  journal={Superconductor Science and Technology},
  author={Scheuerlein, Christian and Andrieux, Jérôme and Michels, Matthias and Lackner, Friedrich and Meyer, Christian and Chiriac, Rodica and Toche, François and Hagner, Matthias and Di Michiel, Marco},
  note={Article Number: 034004}
}

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    <dc:contributor>Toche, François</dc:contributor>
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    <dc:creator>Meyer, Christian</dc:creator>
    <dc:contributor>Hagner, Matthias</dc:contributor>
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    <dcterms:title>Effect of the fabrication route on the phase and volume changes during the reaction heat treatment of Nb&lt;sub&gt;3&lt;/sub&gt;Sn superconducting wires</dcterms:title>
    <dc:date rdf:datatype="http://www.w3.org/2001/XMLSchema#dateTime">2020-08-20T14:14:08Z</dc:date>
    <dc:rights>Attribution 3.0 Unported</dc:rights>
    <dc:contributor>Michels, Matthias</dc:contributor>
    <dc:contributor>Andrieux, Jérôme</dc:contributor>
    <dc:creator>Lackner, Friedrich</dc:creator>
    <dcterms:issued>2020-03-01</dcterms:issued>
    <dc:contributor>Lackner, Friedrich</dc:contributor>
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    <dc:creator>Chiriac, Rodica</dc:creator>
    <dc:contributor>Di Michiel, Marco</dc:contributor>
    <dcterms:abstract xml:lang="eng">Accelerator magnets that can reach magnetic fields well beyond the Nb-Ti performance limits are presently being built and developed, using Nb&lt;sub&gt;3&lt;/sub&gt;Sn superconductors. This technology requires reaction heat treatment (RHT) of the magnet coils, during which Nb&lt;sub&gt;3&lt;/sub&gt;Sn is formed from its ductile precursor materials (a "wind and react" approach). The Nb&lt;sub&gt;3&lt;/sub&gt;Sn microstructure and microchemistry are strongly influenced by the conductor fabrication route, and by the phase changes during RHT. By combining in situ differential scanning calorimetry, high energy synchrotron x-ray diffraction, and micro-tomography experiments, we have acquired a unique data set that describes in great detail the phase and microstructure changes that take place during the processing of restacked rod process (RRP), powder-in-tube (PIT), and internal tin (IT) Nb&lt;sub&gt;3&lt;/sub&gt;Sn wires. At temperatures below 450 °C the phase evolutions in the three wire types are similar, with respectively solid state interdiffusion of Cu and Sn, Cu&lt;sub&gt;6&lt;/sub&gt;Sn&lt;sub&gt;5&lt;/sub&gt; formation, and Cu&lt;sub&gt;6&lt;/sub&gt;Sn&lt;sub&gt;5&lt;/sub&gt; peritectic transformation. Distinct differences in phase evolutions in the wires are found when temperatures exceed 450 °C. The volume changes of the conductor during RHT are a difficulty in the production of Nb&lt;sub&gt;3&lt;/sub&gt;Sn accelerator magnets. We compare the wire diameter changes measured in situ by dilatometry with the phase and void volume evolution of the three types of Nb&lt;sub&gt;3&lt;/sub&gt;Sn wire. Unlike the Nb&lt;sub&gt;3&lt;/sub&gt;Sn wire length changes, the wire diameter evolution is characteristic for each Nb&lt;sub&gt;3&lt;/sub&gt;Sn wire type. The strongest volume increase, of about 5%, is observed in the RRP wire, where the main diameter increase occurs above 600 °C upon Nb&lt;sub&gt;3&lt;/sub&gt;Sn formation.</dcterms:abstract>
    <dc:creator>Hagner, Matthias</dc:creator>
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    <dc:creator>Scheuerlein, Christian</dc:creator>
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