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Radiation induced formation gas bubbles in beryllium after neutron irradiation up to 6000 appm helium production

Klimenkov, Michael ORCID iD icon 1; Jäntsch, Ute; Chakin, Vladimir; Zimber, Nikolai ORCID iD icon 1; Vladimirov, Pavel ORCID iD icon 1
1 Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP), Karlsruher Institut für Technologie (KIT)

Abstract (englisch):

The current interest in mechanical properties and microstructure of neutron irradiated beryllium refers to its planned application in the Helium-Cooled Pebble Bed (HCPB) European concept of a breeding blanket of DEMO. Irradiation experiments in highneutron flux nuclear research reactors yield information about microstructural evolution of beryllium under conditions relevant to fusion (temperature, damage dose, helium and tritium productions) excluding 14 MeV neutrons impact which is not present in the neutron spectra of fission reactors. The HIDOBE-02 irradiation campaign accomplished at the HFR, Petten corresponds to 1246.5 Full Power Days at a reactor power level of 45 MW in the temperature range from 410°C to 680 °C. Transmission electron microscopy (TEM) has been to study the evolution of voids during neutron irradiation at different temperatures. The target preparation of specimens was
performed using focused ion beam (FIB). TEM study shows the formation of radiation induced hexagonal flat gas bubbles inside the grains, however at the lowest irradiation temperature of 410° the pebbles show the uniform shape. The diameters of the bubbles increase from a few nanometers for 410°C to more than hundred nanometers for 680 °C. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000160257
Veröffentlicht am 21.07.2023
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien – Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Proceedingsbeitrag
Publikationsjahr 2023
Sprache Englisch
Identifikator ISBN: 978-3-7315-1284-4
ISSN: 1869-9669
KITopen-ID: 1000160257
HGF-Programm 31.13.04 (POF IV, LK 01) In Vessel Components
Erschienen in Proceedings of the 15th International Workshop on Beryllium Technology (BeWS-15) September, 14-15, 2022, Karlsruhe, Germany
Veranstaltung 15th International Workshop on Beryllium Technology (BeWS 2022), Karlsruhe, Deutschland, 14.09.2022 – 15.09.2022
Verlag Karlsruher Institut für Technologie (KIT)
Seiten 194-205
Serie KIT Scientific Reports ; 7764
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