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Effects of neutron irradiation on the brittle to ductile transition in single crystal tungsten

Abernethy, R. G.; Gibson, J. S. K.-L.; Giannattasio, A.; Murphy, J. D.; Wouters, O.; Bradnam, S.; Packer, L. W.; Gilbert, M. R.; Klimenkov, M.; Rieth, M.; Schneider, H.-C.; Hardie, C. D.; Roberts, S. G.; Armstrong, D. E. J.

Abstract:
Only limited data exist on the effect of neutron irradiation on the brittle to ductile transition (BDT) in tungsten. This work investigates the increase in brittle to ductile transition temperature (BDTT) following neutron irradiation to 1.67 displacements per atom, using four-point bend tests over a range of temperatures (623-1173 K) and strain rates (3.5 x 10$^{-7}$- 2.5 x 10$^{-5}$ s$^{-1}$). The BDTT was found to increase by 500 K after irradiation. The activation energy for the BDT was determined using Arrhenius analysis of the four-point bend tests. Nanoindentation strain-rate jump tests were used to characterise the activation volume for dislocation motion. These were quantified as 1.05 eV and 4.6 b³ respectively, very close to values found for unirradiated tungsten. This suggests that kink-pair formation is the controlling mechanism for the BDT before and after irradiation. This work also carries out a unique verification of inventory-code-modelling (via FISPACT-II) of transmutation of tungsten to rhenium and osmium under neutron irradiation using two independent techniques (X-ray and gamma-ray spectroscopy). These results show that modelling can correctly predict this transmutation, provided that an accurate neutron spectrum is used. ... mehr

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Verlagsausgabe §
DOI: 10.5445/IR/1000098509
Veröffentlicht am 09.01.2020
Originalveröffentlichung
DOI: 10.1016/j.jnucmat.2019.151799
Scopus
Zitationen: 1
Web of Science
Zitationen: 1
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Angewandte Materialien - Angewandte Werkstoffphysik (IAM-AWP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2019
Sprache Englisch
Identifikator ISSN: 0022-3115, 1873-4820
KITopen-ID: 1000098509
HGF-Programm 31.03.09 (POF III, LK 01)
Strukturmaterial f. Blanket und Divertor
Erschienen in Journal of nuclear materials
Band 527
Seiten Article: 151799
Nachgewiesen in Web of Science
Scopus
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