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Substructural State of the High-Entropy Alloy AlCoNiTiNb under Hydrogen Saturation and Heating.

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Názov: Substructural State of the High-Entropy Alloy AlCoNiTiNb under Hydrogen Saturation and Heating.
Autori: Laptev, R. S., Abzaev, Yu. A., Guda, S. A., Klopotov, A. A., Koptsev, M., Tereshchenko, A. V., Ushakov, I. A., Kruglyakov, M., Homidzoda, P., Lider, A. M.
Zdroj: Inorganic Materials: Applied Research; Dec2025, Vol. 16 Issue 6, p1993-1998, 6p
Abstrakt: –—The work investigates the structure and substructural properties of the high-entropy alloy (HEA) AlCoNiTiNb saturated with hydrogen using X-ray diffraction analysis and positron annihilation spectroscopy (PAS). The study examines the changes in hydrogen-induced defects in HEAs during heating in vacuum and hydrogen environments, as well as the influence of temperature and hydrogen content on the formation of various imperfections. Based on a database of crystallographic standards created by the USPEX algorithm, it was established that the structural state is determined by stable phases (STRUC-1, STRUC-2, and STRUC-3). These structures correspond to cells with parameters close to simple cubic lattices. The study revealed correlations between positron annihilation parameters (S and W) and defect concentration as a function of temperature and hydrogen saturation. The expected proportion of hydride phases in the AlCoNiTiNb alloy was estimated to be within 5–10%, with maximum hydrogen accumulation occurring in the temperature range of 200–500°C. Despite the formation of hydride phases, the material demonstrates low cyclic stability, which limits its long-term application in hydrogen energy. [ABSTRACT FROM AUTHOR]
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Abstrakt:–—The work investigates the structure and substructural properties of the high-entropy alloy (HEA) AlCoNiTiNb saturated with hydrogen using X-ray diffraction analysis and positron annihilation spectroscopy (PAS). The study examines the changes in hydrogen-induced defects in HEAs during heating in vacuum and hydrogen environments, as well as the influence of temperature and hydrogen content on the formation of various imperfections. Based on a database of crystallographic standards created by the USPEX algorithm, it was established that the structural state is determined by stable phases (STRUC-1, STRUC-2, and STRUC-3). These structures correspond to cells with parameters close to simple cubic lattices. The study revealed correlations between positron annihilation parameters (S and W) and defect concentration as a function of temperature and hydrogen saturation. The expected proportion of hydride phases in the AlCoNiTiNb alloy was estimated to be within 5–10%, with maximum hydrogen accumulation occurring in the temperature range of 200–500°C. Despite the formation of hydride phases, the material demonstrates low cyclic stability, which limits its long-term application in hydrogen energy. [ABSTRACT FROM AUTHOR]
ISSN:20751133
DOI:10.1134/S2075113325702326