OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 4 2024 HEAs more eff ective for use in high-load and critical areas such as aerospace, automotive, and energy industries. The addition of C and Mo [20] to the alloy contributes to the improvement of its ductility. Carbon and molybdenum can be used for microalloying the alloy, which promotes the formation of fi ne carbide phases in the material structure. These carbides can act as barriers to dislocation movement, enhancing the alloy’s ductility. Hydrogen can also be used to improve alloy ductility by reducing resistance to plastic deformation [21, 22]. Dissolved hydrogen can change the energy of defect formation in the material, which in turn can enhance its ability for plastic deformation. Alloying with Zn [23] and Cu [24] plays a key role in modifying the electrical conductivity of highentropy alloys. This opens the potential for developing energy-saving technologies, electrical conductors, sensors, and electronic components. The change in conductivity properties depends on the alloy composition, temperature, pressure, and the presence of impurities, highlighting the importance of alloying in the modifi cation process of these materials. The fatigue characteristics of high-entropy aluminum-based Al0.5CoCrFeNi alloy thin fi lms with diff erent aluminum additions were also investigated. The results showed that additionof aluminumcaneff ectively reduce the localizationof cyclicdeformations and improve fatigue resistance, which is associated with the reduction of cyclic slip irreversibility [25]. The study [26], also noted that with the addition of Al to the FeCoNiTiAlx coating, the hardness of the coating increased, and it demonstrated better wear resistance. Alloying plays an important role in modifying various properties of HEAs. Various elements such as molybdenum, cobalt, boron, niobium, tungsten carbide, titanium, aluminum, neodymium, carbon, copper, and zinc are used to improve the corrosion resistance, wear resistance, thermal stability, strength, plasticity, and conductive properties of high-entropy alloys (fi g. 3). Fig. 3. Improving the properties of high-entropy alloys by alloying Thus, alloying represents a powerful tool for modifying high-entropy alloys to achieve specifi c desired properties and expand its application areas. Coatings and its Properties Methods of Obtaining Coatings from HEAs Studying the materials published in both Russian and foreign sources over the past few years, it becomes obvious that scientists are interested in obtaining thin fi lms and coatings from HEAs. This conclusion is also confi rmed by the study [27], which highlights a signifi cant increase in the study of HEAs fi lms and coatings and surface modifi cation by various methods over the last fi ve years.
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