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Precipitous Change Of The Irreversible Strain Limit With Heat-treatment Temperature In Nb3sn Wires Made By The Restacked-rod Process

Title: Precipitous Change Of The Irreversible Strain Limit With Heat-treatment Temperature In Nb3sn Wires Made By The Restacked-rod Process.
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Name(s): Cheggour, Najib, author
Stauffer, Theodore C., author
Starch, William, author
Lee, Peter J., author
Splett, Jolene D., author
Goodrich, Loren F., author
Ghosh, Arup K., author
Type of Resource: text
Genre: Journal Article
Text
Journal Article
Date Issued: 2018-08-29
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: The intrinsic irreversible strain limit epsilon(irr,0) of Nb3Sn superconducting wires, made by the restacked-rod process and doped with either Ti or Ta, undergoes a precipitous change as a function of temperature. of the final heat-treatment for forming the A15 phase. Nb3Sn transitions from a highly brittle state where it cracks as soon as it is subjected to an axial tensile strain of any measurable amount, to a state more resilient to tensile strain as high as 0.4%. The remarkable abruptness of this transition (as most of it occurs over a range of only 10 degrees C) could pose real challenges for the heat-treatment of large magnets, such as those fabricated for the high-luminosity upgrade of the Large Hadron Collider (LHC). We named this behavior the strain irreversibility cliff (SIC) to caution magnet developers. The approach to fulfilling application requirements just in terms of the conductor's residual resistivity ratio RRR and critical-current density J(c) is incomplete. Along with RRR and J(c) wire specifications, and sub-element size requirements that reduce wire magnetization and instabilities effects, SIC imposes additional constraints on the choice of heat-treatment conditions to ensure mechanical integrity of the conductor.
Identifier: FSU_libsubv1_wos_000443004500004 (IID), 10.1038/s41598-018-30911-x (DOI)
Keywords: field, superconductors
Publication Note: The publisher’s version of record is available at https://doi.org/10.1038/s41598-018-30911-x
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000443004500004
Owner Institution: FSU
Is Part Of: Scientific Reports.
2045-2322
Issue: vol. 8

Choose the citation style.
Cheggour, N., Stauffer, T. C., Starch, W., Lee, P. J., Splett, J. D., Goodrich, L. F., & Ghosh, A. K. (2018). Precipitous Change Of The Irreversible Strain Limit With Heat-treatment Temperature In Nb3sn Wires Made By The Restacked-rod Process. Scientific Reports. Retrieved from http://purl.flvc.org/fsu/fd/FSU_libsubv1_wos_000443004500004