Structure and Mechanical Properties of Bimetal Nb/Cu Rods for Production of Nb3Sn Superconductors

To construct magnetic systems in modern high-energy physics projects, such as creation of the Future Circular Collider (FCC) and modernization of the Large Hadron Collider (HL-LHC), Nb 3 Sn superconductors with a high level of electrophysical properties, above all being a high current carrying capac...

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Bibliographic Details
Published in:Inorganic materials : applied research 2020, Vol.11 (4), p.751-756
Main Authors: Abdyukhanov, I. M., Tsapleva, A. S., Alekseev, M. V., Figurovskii, D. K., Dergunova, E. A., Morosanov, A. V., Pantsyrnyi, V. I.
Format: Article
Language:English
Subjects:
Bimetals
Carrying capacity
Chemistry
Chemistry and Materials Science
Copper
Grain structure
Industrial Chemistry/Chemical Engineering
Inorganic Chemistry
Large Hadron Collider
Materials Science
Mechanical properties
Modernization
Niobium
Plastic deformation
Recrystallization
Rods
Sheaths
Tin
Tin base alloys
Wire
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Summary:To construct magnetic systems in modern high-energy physics projects, such as creation of the Future Circular Collider (FCC) and modernization of the Large Hadron Collider (HL-LHC), Nb 3 Sn superconductors with a high level of electrophysical properties, above all being a high current carrying capacity, are requisite. Such multifilament Nb 3 Sn superconductors are obtained by the technique of internal feeding of tin (IFT), consisting in deformation of a composite including high-purity niobium, copper, and tin to make a wire smaller less than 1 mm in diameter. The presence of such components as tin-based alloys or pure tin with T m = 232°C in the composite wire composition precludes the possibility of Nb recrystallization annealing, which imposes strict requirements on the Nb mechanical properties, which determine the Nb capability for plastic deformation. In the study, the influence of the design and conditions of creating bimetal Nb/Cu rods on the grain structure of niobium and the state of the boundary between it and a copper sheath is discussed. The mechanical properties of rods at different steps of their fabrication are investigated. The results will be applied in development of the technological conditions of manufacture of Nb 3 Sn superconductors by the IFT technique.
ISSN:2075-1133
2075-115X
DOI:10.1134/S2075113320040024