NDLI: Influence of the Heat-Treatment Process on the Mechanical Properties and Dimensions of Multi-Filamentary Composite Nb3Sn Superconducting Wires

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Influence of the Heat-Treatment Process on the Mechanical Properties and Dimensions of Multi-Filamentary Composite Nb3Sn Superconducting Wires

Content Provider	CiteSeerX
Author	Harvey, D. A. Durodola, J. F. Twin, A.
Abstract	Abstract. The levels of stress and strain experienced by the windings of a superconducting magnet during its manufacture and operation are dependent on the mechanical properties of the multi-filamentary composite wire that the windings are comprised of. It is also influenced by the change in dimensions of the wire during the reaction heat-treatment stage of the manufacturing process. Using specimens cut from a spool of 1.5mm diameter niobium tin type superconducting wire, the influence of the heat-treatment process on the mechanical properties and dimensions have been investigated. The heat-treatment was carried out in an inert atmosphere using apparatus specially developed for the purpose. For heat-treatment durations up to that required to complete the reaction of the niobium filaments into Nb3Sn, the volume and diameter of the wires increased with increasing heat-treatment duration. The maximum increase was 2 % and 0.8 % respectively. The length of the wires decreased slightly for the shorter heat-treatments, but increased up to 0.33 % for the longer ones. The mechanical properties were significantly different for specimens that had no heat-treatment compared to those that had only a short heat-treatment, one that was insufficient to convert much of the niobium into Nb3Sn. Before heat-treatment the bronze within the wires is in a work-hardened state, but gets annealed during the heat-treatment and this is probably the major
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Subject Keyword	Work-hardened State Multi-filamentary Composite Nb3sn Superconducting Wire Multi-filamentary Composite Wire Heat-treatment Duration Superconducting Magnet Diameter Niobium Tin Type Heat-treatment Process Specimen Cut Reaction Heat-treatment Stage Short Heat-treatment Maximum Increase
Content Type	Text
Resource Type	Article

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