Article
Analysis of Nb3Sn structural and electrophysical superconductor characteristics under simulated deformation
N. V. Konovalova
JSC “Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar”, (JSC VNIINM), ul. Rogova, 5a, 123098, Moscow, Russia.
e-mail: NViKonovalova@bochvar.ru
I. M. Abdyukhanov
JSC “Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar”, (JSC VNIINM), ul. Rogova, 5a, 123098, Moscow, Russia.
A. S. Tsapleva
JSC “Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar”, (JSC VNIINM), ul. Rogova, 5a, 123098, Moscow, Russia.
K. A. Mareev
JSC “Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar”, (JSC VNIINM), ul. Rogova, 5a, 123098, Moscow, Russia.
M. V. Polikarpova
JSC “Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar”, (JSC VNIINM), ul. Rogova, 5a, 123098, Moscow, Russia.
G. A. Zakharova
JSC “Advanced Research Institute of Inorganic Materials named after Academician A. A. Bochvar”, (JSC VNIINM), ul. Rogova, 5a, 123098, Moscow, Russia.
A. L. Vasiliev
Kurchatov Complex of Crystallography and Photonics of the National Research Centre “Kurchatov Institute”, Leninsky Prospekt, 51, 119333, Moscow, Russia.
V. V. Artemov
Kurchatov Complex of Crystallography and Photonics of the National Research Centre “Kurchatov Institute”, Leninsky Prospekt, 51, 119333, Moscow, Russia
Abstract
The creation of Future Circular Collider (FCC) dipole magnet with 16 T working magnetic field will require the development of superconductors with a high critical current density with subsequent manufacturing of the cable without significant deterioration of their electrophysical properties. The analysis of electrophysical properties and quantitative microscopy of the developed Nb3Sn strands manufactured at JSC VNIINM are conducted. To simulate cable deformation the effect of uniaxial rolling with different degrees of strand deformation on its microstructure and properties was estimated. Results show that uniaxial rolling with 10–30% deformation degree leads to distortion not only peripheral but also central row of subelements. Deformation degree increase results in subelements distortion that located at maximum shift angle. The destruction of barrier occurs in these areas, which leads to tin diffusion to copper stabilizing sheath. Microstructure analysis results help in optimal strand diameter selection for use in Rutherford type cables.
Keywords: superconductor; cable; strand; Nb3Sn; microstructure; aspect ratio.
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