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Article

Distribution of Hydrogen and Defects in the Zr/Nb Nanoscale Multilayer Coatings after Proton Irradiation

1
Division for Experimental Physics, National Research Tomsk Polytechnic University, 634050 Tomsk, Russia
2
Department of Structural Research, Institute of Nuclear Physics Polish Academy of Sciences, 31342 Krakow, Poland
3
Dzhelepov Laboratory of Nuclear Problems, Joint Institute for Nuclear Research, 141980 Dubna, Russia
4
Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia
5
Department of Solid State Physics, Belarusian State University, 220006 Minsk, Belarus
*
Author to whom correspondence should be addressed.
Academic Editor: George Wardeh
Materials 2022, 15(9), 3332; https://doi.org/10.3390/ma15093332
Received: 19 April 2022 / Revised: 29 April 2022 / Accepted: 4 May 2022 / Published: 6 May 2022
(This article belongs to the Special Issue Feature Paper Collection of Topical Advisory Members)
Radiation damage is one of the significant factors limiting the operating time of many structural materials working under extreme conditions. One of the promising directions in the development of materials that are resistant to radiation damage and have improved physical and mechanical properties is the creation of nanoscale multilayer coatings (NMCs). The paper is devoted to the experimental comprehension of changes in the defect structure and mechanical properties of nanoscale multilayer coatings (NMCs) with alternating layers of Zr and Nb under irradiation. Series of Zr/Nb NMCs with different thicknesses of individual layers were fabricated by magnetron sputtering and subjected to H+ irradiation. The evolution of structure and phase states, as well as the defect state under proton irradiation, was studied using the methods of high-resolution transmission electron microscopy (HRTEM), X-ray diffraction analysis (XRD), glow discharge optical emission spectroscopy (GDOES), and positron annihilation spectroscopy (PAS). The layer-by-layer analysis of structural defects was carried out by Doppler broadening spectroscopy (DBS) using a variable-energy positron beam. To estimate the binding energy and the energy paths for the hydrogen diffusion in Zr/Nb NMCs, calculations from the first principles were used. When the thickness of individual layers is less than 25 nm, irradiation causes destruction of the interfaces, but there is no significant increase in the defect level, the S parameter (open volume defects amount) before and after irradiation is practically unchanged. After irradiation of NMC Zr/Nb with a thickness of layers 50 and 100 nm, the initial microstructure is retained, and the S parameter is significantly reduced. The GDOES data reveal the irregular H accumulation at the interface caused by significant differences in H diffusion barriers in the bulk of Zr and Nb multilayers as well as near the interface’s region. View Full-Text
Keywords: nanoscale multilayer coatings; H+ irradiation; density functional theory; positron annihilation; radiation defects nanoscale multilayer coatings; H+ irradiation; density functional theory; positron annihilation; radiation defects
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MDPI and ACS Style

Laptev, R.; Stepanova, E.; Pushilina, N.; Svyatkin, L.; Krotkevich, D.; Lomygin, A.; Ognev, S.; Siemek, K.; Doroshkevich, A.; Uglov, V. Distribution of Hydrogen and Defects in the Zr/Nb Nanoscale Multilayer Coatings after Proton Irradiation. Materials 2022, 15, 3332. https://doi.org/10.3390/ma15093332

AMA Style

Laptev R, Stepanova E, Pushilina N, Svyatkin L, Krotkevich D, Lomygin A, Ognev S, Siemek K, Doroshkevich A, Uglov V. Distribution of Hydrogen and Defects in the Zr/Nb Nanoscale Multilayer Coatings after Proton Irradiation. Materials. 2022; 15(9):3332. https://doi.org/10.3390/ma15093332

Chicago/Turabian Style

Laptev, Roman, Ekaterina Stepanova, Natalia Pushilina, Leonid Svyatkin, Dmitriy Krotkevich, Anton Lomygin, Sergei Ognev, Krzysztof Siemek, Aleksandr Doroshkevich, and Vladimir Uglov. 2022. "Distribution of Hydrogen and Defects in the Zr/Nb Nanoscale Multilayer Coatings after Proton Irradiation" Materials 15, no. 9: 3332. https://doi.org/10.3390/ma15093332

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