2026-03-12T16:55:13Z https://repo.qst.go.jp/oai

oai:repo.qst.go.jp:00084518 2023-05-15T18:22:28Z 1

Neutron irradiation-enhanced grain growth in tungsten and tungsten alloys Gietl, Hanns Koyanagi, Takaaki Hu, Xunxiang Fukuda, Makoto Hasegawa, Akira Katoh, Yutai Makoto, Fukuda metadata only access 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 per formed 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 crystallization is an important consideration when designing and applying W to plasma-facing components in future nuclear fusion reactors. Elsevier 2021-12 eng journal article https://repo.qst.go.jp/records/84518 10.1016/j.jallcom.2021.163419 https://www.sciencedirect.com/science/article/abs/pii/S0925838821048295?via%3Dihub 0925-8388 Journal of Alloys and Compounds 901 163419