Study of Helium Swelling and Embrittlement Mechanisms in SiC Ceramics

Tynyshbayeva K.M. Kadyrzhanov K.K. Kozlovskiy A.L. Kuldeyev Y.I. Uglov V. Zdorovets M.V.
February 2022 MDPI

Crystals
2022 #12 Issue 2

This work is devoted to the study of the radiation damage kinetics and subsequent embrittlement of the near-surface layer of SiC ceramics subjected to irradiation with low-energy He²⁺ ions. Interest in these types of ceramics is due to their great prospects for use as structural materials for nuclear power, as well as for use in the creation of protective structures for longterm storage of spent nuclear fuel. During the study, the dependences of changes in the structural, mechanical, strength, and morphological characteristics of SiC ceramics depending on irradiation fluence were obtained. It has been established that the greatest changes in the strength properties are associated with the dominance of the crystal lattice swelling effect in the structure due to an increase in the concentration of implanted helium, and its further agglomeration with the formation of vacancy complexes of the He-V type. A model for changing the structural properties of ceramics irradiated with low-energy He²⁺ ions based on the change in the contributions of the dislocation density concentration, anisotropic distortion of the crystal lattice, and the effect of swelling as a result of implantation is proposed.

Degradation of the near-surface layer , Embrittlement , Gas swelling , He²⁺ ions , Radiation damage , Silicon carbide

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Engineering Profile Laboratory, L.N. Gumilyov, Eurasian National University, Nur-Sultan, 010008, Kazakhstan
Laboratory of Solid State Physics, The Institute of Nuclear Physics, Almaty, 050032, Kazakhstan
Institute of Geology and Oil and Gas Business, Satbayev University, Almaty, 050032, Kazakhstan
Department of Solid State Physics, Belarusian State University, Minsk, 220050, Belarus
Physics and Technology Faculty, National Research Tomsk State University, Tomsk, 634050, Russian Federation
Department of Intelligent Information Technologies, Ural Federal University, Yekaterinburg, 620075, Russian Federation

Engineering Profile Laboratory
Laboratory of Solid State Physics
Institute of Geology and Oil and Gas Business
Department of Solid State Physics
Physics and Technology Faculty
Department of Intelligent Information Technologies

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