2026-03-12T17:23:06Z 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 1020173 Koyanagi, Takaaki 1020174 Hu, Xunxiang 1020175 Fukuda, Makoto 1020176 Hasegawa, Akira 1020177 Katoh, Yutai 1020178 Makoto, Fukuda 1020179 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. journal article Elsevier 2021-12 Journal of Alloys and Compounds 901 163419 0925-8388 https://repo.qst.go.jp/records/84518 eng 10.1016/j.jallcom.2021.163419 https://www.sciencedirect.com/science/article/abs/pii/S0925838821048295?via%3Dihub metadata only access