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Electro-hydraulic forming of SRF cavities: Effect of strain rate on niobium single crystals

  • An investigation of the dislocation substructure and mechanical properties of high-purity niobium single crystals with different initial crystal orientations deformed in tension at strain rates of 10^{-4} to 10^3 s^{-1} is presented. Specimens were cut from a large grain niobium disk used for the manufacturing of SRF cavities. Different crystallographic tensile directions exhibited significantly different softening and hardening behaviors and elongation at fracture. Such anisotropy is reduced at high strain rates. Also, different dislocation substructures were observed with TEM at low and high strain rates. At low strain rates, dislocation cells with a high density of long dislocations were observed. At high strain rates, homogeneously distributed dislocations with a higher dislocation dipole density were observed. The relationship between the differences in dislocation substructures and mechanical properties at low and high strain rates and the potential effects on the superconductingAn investigation of the dislocation substructure and mechanical properties of high-purity niobium single crystals with different initial crystal orientations deformed in tension at strain rates of 10^{-4} to 10^3 s^{-1} is presented. Specimens were cut from a large grain niobium disk used for the manufacturing of SRF cavities. Different crystallographic tensile directions exhibited significantly different softening and hardening behaviors and elongation at fracture. Such anisotropy is reduced at high strain rates. Also, different dislocation substructures were observed with TEM at low and high strain rates. At low strain rates, dislocation cells with a high density of long dislocations were observed. At high strain rates, homogeneously distributed dislocations with a higher dislocation dipole density were observed. The relationship between the differences in dislocation substructures and mechanical properties at low and high strain rates and the potential effects on the superconducting properties are discussed.zeige mehrzeige weniger

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Autor*innen:Jean-Francois Croteau
Koautor*innen:E. Pai Kulyadi, Leonardo Agudo Jácome, C. Kale, E. García-Tabarés Valdivieso, A. T. Perez Fontenla, D. Siu, D. Kang, P. Eisenlohr, T. R. Bieler, K. N. Solanki, Anna Maria Manzoni, S. Atieh, D. Balint, P. Hooper, N. Jacques, E. Cantergiani
Dokumenttyp:Vortrag
Veröffentlichungsform:Präsentation
Sprache:Englisch
Jahr der Erstveröffentlichung:2021
Organisationseinheit der BAM:5 Werkstofftechnik
5 Werkstofftechnik / 5.1 Mikrostruktur Design und Degradation
DDC-Klassifikation:Technik, Medizin, angewandte Wissenschaften / Ingenieurwissenschaften / Ingenieurwissenschaften und zugeordnete Tätigkeiten
Freie Schlagwörter:Dislocation substructure; Strain rate dependence; Transmission electron microscopy (TEM)
Themenfelder/Aktivitätsfelder der BAM:Material
Material / Degradation von Werkstoffen
Veranstaltung:2021 International Conference on RF Superconductivity (SRF'21)
Veranstaltungsort:Online meeting
Beginndatum der Veranstaltung:28.06.2021
Enddatum der Veranstaltung:02.07.2021
URL:https://indico.frib.msu.edu/event/38/attachments/158/1089/TUPCAV012_poster.pdf
Verfügbarkeit des Dokuments:Datei im Netzwerk der BAM verfügbar ("Closed Access")
Datum der Freischaltung:29.03.2022
Referierte Publikation:Nein
Eingeladener Vortrag:Nein
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