@article{389631b9be694e4d89026585cb608bb3,
title = "Neutron irradiation-enhanced grain growth in tungsten and tungsten alloys",
abstract = "To understand the microstructural stability of candidate plasma-facing materials under fusion-relevant environments, neutron irradiation of W and W-3%Re alloys with and without K and La dopants was performed in the mixed-spectrum High Flux Isotope Reactor at nominal temperatures of ~850 °C and ~1100 °C to calculated doses between 0.42 and 0.47 dpa. To the best of our knowledge, this study presents the first experimental evidence of radiation-enhanced recrystallization in W and undoped W–Re alloys at ~850 °C, conditions where thermal annealing does not cause any grain growth in a similar timescale. Potassium- or lanthanum-doped tungsten alloys showed more resistance to radiation-enhanced grain growth. We explain the acceleration of grain growth by analyzing the self-diffusion constant under atomic displacement environments. The microstructural observations of the studied W variants suggest that La doping is more effective than K doping for mitigating recrystallization. This study also found that radiation-enhanced recrystallization is an important consideration when designing and applying W to plasma-facing components in future nuclear fusion reactors.",
keywords = "Neutron irradiation, Recrystallization, Tungsten, Tungsten alloys",
author = "Hanns Gietl and Takaaki Koyanagi and Xunxiang Hu and Makoto Fukuda and Akira Hasegawa and Yutai Katoh",
note = "Funding Information: The authors thank the ORNL LAMDA technical team for assistance in property characterization and annealing. Additionally, the authors thank John Echols and Chad Perish for their technical review of the manuscript. This work was performed as part of the US-Japan PHENIX Cooperation Collaboration Project Technological Assessment of Plasma Facing Components for DEMO Reactors, supported by the US Department of Energy, Office of Science, Fusion Energy Sciences and Ministry of Education, Culture, Sports, Science and Technology, Japan. ORNL research was sponsored by the US Department of Energy, Office of Fusion Energy Sciences, under contract DE-AC05–00OR22725 with UT-Battelle LLC. A portion of this research used resources at the HFIR, a US Department of Energy Office of Science User Facility operated by ORNL. X. Hu's effort was partially supported by the Science Specialty Program of Sichuan University (Grant no. 2020SCUNL210). Funding Information: The authors thank the ORNL LAMDA technical team for assistance in property characterization and annealing. Additionally, the authors thank John Echols and Chad Perish for their technical review of the manuscript. This work was performed as part of the US-Japan PHENIX Cooperation Collaboration Project Technological Assessment of Plasma Facing Components for DEMO Reactors, supported by the US Department of Energy, Office of Science, Fusion Energy Sciences and Ministry of Education, Culture, Sports, Science and Technology, Japan. ORNL research was sponsored by the US Department of Energy, Office of Fusion Energy Sciences , under contract DE-AC05–00OR22725 with UT-Battelle LLC . A portion of this research used resources at the HFIR, a US Department of Energy Office of Science User Facility operated by ORNL. X. Hu{\textquoteright}s effort was partially supported by the Science Specialty Program of Sichuan University (Grant no. 2020SCUNL210 ). Funding Information: Notice: This manuscript has been authored by UT-Battelle, LLC, under contract DE-AC05–00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). Publisher Copyright: {\textcopyright} 2021 Elsevier B.V.",
year = "2022",
month = apr,
day = "25",
doi = "10.1016/j.jallcom.2021.163419",
language = "English",
volume = "901",
journal = "Journal of Alloys and Compounds",
issn = "0925-8388",
publisher = "Elsevier BV",
}