Publication: PERSPECTIVE FUNCTIONAL MATERIALS UNDER EXTREME CONDITIONS: HIGH HEAT AND PARTICLE FLUXES AND NEUTRON IRRADIATION
Дата
2019
Авторы
OGORODNIKOVA, O. V.
KLIMOV, N. S.
GASPARYAN, Yu. M.
EFIMOV, V. S.
POSKAKALOV, А. G.
KAZIEV, A. V.
KHARKOV, M. M.
VOLKOV, N. V.
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Аннотация
In a thermonuclear reactor, materials will be irradiated with energetic particles of hydrogen isotopes and helium (He), neutrons, and heat fluxes. Tungsten and dense nano-structured tungsten (W) coatings are used as plasma-facing materials in current tokamaks and are the reference materials of the ITER divertor and DEMO reactor and the possibility of using reduced-activated ferrite-martensitic, RAFM, steels not only as structural materials, but also as the material of the first wall of the thermonuclear reactor is considered. Also, these steels, together with a new generation oxide dispersion strengthening (ODS) steels by the addition of Y2O3 particles are considered as promising materials for fast neutron fuel cladding. In structural materials of the reactor core on fast neutrons at deep burn-up of nuclear fuel (15-20% and more t.a.) and, especially, the first wall and other nodes of the fusion reactor chamber, together with a high level of radiation damage, there will be an accumulation of significant amounts of helium and hydrogen isotopes. Hydrogen embrittlement and helium swelling in a fusion reactor are important issues that determine the applicability of the material and can cause a reduction in the lifetime of reactor components. Moreover, accumulation of helium in a metal at elevated temperatures leads to the growth of the so-called nano-structured ‘fuzz’ on the metal surface as well as high heat fluxes significantly change the near surface layers by melting and cracking. In this regard, the study of the accumulation of helium and hydrogen isotopes in W-based materials and in RAFM steels, the study of surface modification under the influence of plasma irradiation and a fundamental understanding of radiation damage in W- and Fe- based materials is critical for the design of materials in extreme environment, for example, for fusion reactors.
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Цитирование
PERSPECTIVE FUNCTIONAL MATERIALS UNDER EXTREME CONDITIONS: HIGH HEAT AND PARTICLE FLUXES AND NEUTRON IRRADIATION [Text.]/ OGORODNIKOVA O.V. [и др.] //Взаимодействие плазмы с поверхностью: сборник научных трудов XXII конференции. - 2019. - С. 98-99