Journal
JOURNAL OF NUCLEAR MATERIALS
Volume 538, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.jnucmat.2020.152150
Keywords
Dual beam; in-situ; Dislocation loops; Irradiation damage; Fusion
Funding
- U.S. Department of Energy, Office of Nuclear Energy under DOE Idaho Operations Office [DE-AC07-051D14517]
- Laboratory Directed Research and Development program of Los Alamos National Laboratory [20160674PRD3]
- National Science Foundation [1810040]
- U.S. Department of Energy [DE-SC0017899]
- U.S. Department of Energy through the LANL/LDRD Program
- G. T. Seaborg Institute
- U.S. Department of Energy, Office of Science, Office of Fusion Energy Sciences, and Office of Advanced Scientific Computing Research through the Scientific Discovery through Advanced Computing (SciDAC) project on PlasmaeSurface Interactions [DE-SC0008875]
- SciDAC project on Plasma Surface Interactions
- DOE Fusion Energy Sciences [DE-SC-0006661]
- U.S. Department of Energy (DOE) [DE-SC0017899] Funding Source: U.S. Department of Energy (DOE)
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1810040] Funding Source: National Science Foundation
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Elucidating the synergistic effects of different energetic beams on the radiation response of nuclear materials is critical for developing an improved methodology for their evaluation when exposed to extreme environments. This article describes in-situ sequential (He implantation followed by Kr irradiation and vice-versa) and simultaneous (heavy ion Kr irradiation and He implantation) dual beam irradiations performed on tungsten at 1223 K. Dislocation loop density, average area, and total loop damage as a function of irradiation history and dose/fluence are quantified. The loop Burgers vectors and cavity damage (cavity density, size and total change in volume) are also determined at the final maximum dose for each condition. The loop damage evolution was different in all cases, with the smallest loop damage observed in the simultaneous experiment. Annihilation of Kr generated dislocation loops during He implantation in the Kr thorn He experiment was an unanticipated observation that may be explained by the dynamic evolution of dislocation loop sink strengths and time-dependent defect fluxes. Dislocation loop raft formation, denuded zones near extended defects, and cavity damage are compared across the different conditions. The phenomena observed and discussed in this work will stimulate further experimental and computational modeling activities leading to improved fundamental understanding of the irradiation response of nuclear materials under reactor-similar environments. Published by Elsevier B.V.
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