This paper presents a review of a number of works devoted to the studies of high-entropy alloys (HEAs). As is known, HEAs represent a new class of materials that have attracted the attention of scientists due to their unique properties and prospects of application in hydrogen power engineering. The peculiarity of HEAs is their high entropy of mixing, which provides phase stability and flexibility in developing materials with given characteristics. The main focus of this paper is on the application of HEAs for solid-state hydrogen storage, their physicochemical and mechanical properties, and synthesis technologies. Recent advances in the hydrogen absorption properties of HEAs are analyzed, including their ability to efficiently absorb and desorb hydrogen at moderate temperatures and pressures. Prospects for their use in the development of environmentally safe and efficient hydrogen storage systems are considered. The work also includes a review of synthesis methods aimed at optimizing the properties of HEAs for hydrogen energy applications.

This review paper presents a detailed analysis of the influence of high-velocity oxygen–fuel (HVOF) spraying parameters on the microstructure formation and performance characteristics of Cr₃C₂-NiCr coatings. Key HVOF parameters, including the spray distance, oxygen-to-fuel ratio, powder feed rate, and spraying temperature, are examined in relation to their impact on coating properties. Structural parameters such as density, porosity, adhesive strength, and microhardness, which determine the mechanical behavior of the coating, are analyzed. Special attention is paid to wear resistance mechanisms, adhesion to the substrate, and resistance to fatigue failure. Additionally, the thermal stability of the coatings, their coefficient of thermal expansion, and oxidation resistance are investigated. This study also evaluates the morphology and phase composition of the coatings under different HVOF spraying conditions. An overview of modern diagnostic techniques, such as electron microscopy and spectroscopy, is provided. Compared to traditional surface treatment methods, HVOF spraying offers superior coating density, higher adhesion strength, and enhanced wear and corrosion resistance, making it an effective solution for extending the service life of components. Based on the findings, this paper highlights promising applications of Cr₃C₂-NiCr coatings in the aviation, power engineering, and mechanical engineering industries, where high wear resistance and thermal stability are crucial.

—Проблемы данного исследования связаны с недостатками, которые всегда существовали и обострились в последнее время в практике изучения электромагнитных явлений в отдельных электрических цепях в школе. В качестве одного из путей преодоления имеющихся недостатков рассмотрим усиление физической составляющей при исследовании материала электрических цепей. В соответствии с этим проблему исследования можно сформулировать в виде вопроса: какова педагогическая целесообразность использования современных микропроцессорных систем и математического моделирования с точки зрения повышения качества физических знаний и эффективности их применения в учебном процессе? изучение электрических схем? Для решения поставленных задач использовались следующие методы исследования: проведение педагогического эксперимента и анализ его результатов с целью определения эффективности использования компьютерного моделирования при изучении физических основ электрических цепей, теоретический анализ методической литературы. Разработана методика применения компьютерного моделирования и показана его роль в создании условий для внедрения исследовательского метода обучения в практику. В результате педагогического эксперимента доказана эффективность разработанных подходов к использованию компьютерных моделей в экспериментальной деятельности студентов с целью развития интеллектуальных способностей, формирования исследовательского подхода и стимулирования творческой активности студентов. теоретический анализ методической литературы. Разработана методика применения компьютерного моделирования и показана его роль в создании условий для внедрения исследовательского метода обучения в практику. В результате педагогического эксперимента доказана эффективность разработанных подходов к использованию компьютерных моделей в экспериментальной деятельности студентов с целью развития интеллектуальных способностей, формирования исследовательского подхода и стимулирования творческой активности студентов. теоретический анализ методической литературы. Разработана методика применения компьютерного моделирования и показана его роль в создании условий для внедрения исследовательского метода обучения в практику. В результате педагогического эксперимента доказана эффективность разработанных подходов к использованию компьютерных моделей в экспериментальной деятельности студентов с целью развития интеллектуальных способностей, формирования исследовательского подхода и стимулирования творческой активности студентов.

This article presents a review of current research on the use of molybdenum disulfide (MoS₂) and its composites as promising materials for energy storage systems and functional coatings. Various MoS₂ morphologies, including nanoflowers, nanoplatelets, and nanorods, are considered, as well as their effects on electrochemical properties and specific capacity. Particular attention is paid to strategies for modifying MoS₂ using carbon nanomaterials (graphene, carbon nanotubes, porous carbon) and conductive polymers, which improve electrical conductivity, structural stability, and durability of electrodes. The important role of chemical vapor deposition (CVD), which allows the formation of uniform coatings with high purity, controlled thickness, and improved performance characteristics, is noted. A comparative analysis of advances in the application of MoS₂ in sodium-ion batteries, supercapacitors, and microwave absorbers is provided. It has been shown that the synergy of MoS₂ with carbon and polymer components, as well as the use of advanced deposition technologies, including CVD, opens new prospects for the development of low-cost, stable, and highly efficient energy storage devices.

The effects of post-processing heat treatment on the structural and phase state and hydrogen sorption characteristics of an equiatomic TiZrNbVTa high-entropy alloy produced by mechanical activation and spark plasma sintering were investigated. The powder mixture was mechanically activated under argon and consolidated at 1450 °C. Two processing conditions were compared: SPS with a 7 min hold without subsequent treatment, and SPS with a 5 min hold followed by annealing at 1050 °C for 5 h. Phase composition was analyzed by X-ray diffraction. Hydrogenation was performed at 400–600 °C under a hydrogen pressure of 37–40 bar. Hydrogen content was evaluated using the SOAK kinetic method and inert gas fusion analysis with a RHEN-602 analyzer. Both materials were predominantly composed of a Nb-enriched body-centered cubic phase, whereas their secondary-phase compositions differed. After annealing, weak reflections tentatively attributed to ZrO₂ and TaO₂ appeared, whereas reflections previously assigned to Zr, V, and TiO₂ could no longer be resolved. According to the RHEN-602 measurements, the hydrogen content ranged from 1.12 to 1.37 wt.% for the SPS sample and from 0.64 to 2.08 wt.% for the SPS-HT sample between 400 and 600 °C. These results indicate that processing involving high-temperature annealing modifies the phase state and may enhance hydrogen uptake at 500–600 °C.

This paper presents an overview of studies aimed at obtaining tungsten carbide alloys with preliminary mechanical activation (MA). MA is widely used in the field of materials science and is aimed at changing the physical and mechanical properties of materials in order to increase the activity of their reaction during research. In this regard, the main attention in this article is focused on the study of the effect of mechanical activation on tungsten carbide (WC) mixtures. WC-based hard alloys are used in various industrial conditions due to their excellent mechanical properties and outstanding wear resistance in combination with high strength and heat resistance, moreover, more than half of the production of WC-based hard alloys is associated with the manufacture of cutting tools. The article also presents complex types of mechanical activation used in various studies. And also considered the effect of the types of mechanical activation of mixtures on the physical and mechanical properties of the obtained alloys. An analysis of the optimal conditions for powder consolidation by spark-plasma sintering (SPS) is carried out, which allows achieving high density and strength of materials.