OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 4 2024 important factor is the infl uence of various processing and annealing technologies on the microstructure and properties of alloys. Studies show that optimizing these parameters can signifi cantly improve the corrosion resistance of materials. Heat Resistance and Thermal Stability of High-Entropy Alloys Heat resistance and thermal stability play a crucial role in the development of HEAs, which are a promising class of materials with unique properties. This section will explore the key aspects related to the resistance of these alloys to high temperatures and thermal cycling. It will analyze the infl uence of alloy composition, processing, and microstructure on its thermal properties, as well as discuss methods to improve the heat resistance and stability of HEAs. In recent years, considerable attention of foreign researchers has been attracted by the development of refractory HEAs, which are considered as a promising class of materials for high-temperature applications. These alloys possess unique mechanical properties and have the potential to replace traditional nickelbased superalloys in the next generation of technologies [44]. Particular attention in the research is paid to the use of electrodeposited nanostructured alloys such as NiFeCoW, NiFeCoMo and NiFeCoMoW. These materials have high thermal and structural stability at elevated temperatures and show a signifi cant increase in hardness after annealing. Electrodeposition is an eff ective and aff ordable method for synthesizing nanostructured alloys, providing high thermal stability [45]. Another important aspect is the use of methods aimed at improving thermal stability. Among these, longterm annealing and high-pressure torsion (HPT) are of particular importance. Long-term annealing promotes the recrystallization of the material, enhancing its properties [46]. HPT is an eff ective technological process for changing the shape and structure of materials by rotating under pressure, applied in various industries, including metallurgy, plastics, and composites [47]. The study [48] demonstrated that replacing molybdenumwith vanadium in HEAs has a signifi cant impact on its structural and thermal properties. This approach leads to the formation of crystalline complex nitride particles in a ribbon structure, which positively aff ects thermal stability and helps stabilize supercooled liquids in alloys with a fully amorphous structure. Additionally, the study [49] confi rms that the thermal stability of the high-entropy Cr0.8FeMn1.3Ni1.3 alloy is signifi cantly dependent on the aging temperature. When treated at 300 °C, the alloy microstructure remains stablewithminimal changes inmechanical properties. However, at higher temperatures (500 and 700 °C), a complex phase decomposition is observed, which signifi cantly aff ects its mechanical characteristics. These results highlight the need for strict control of heat treatment parameters to achieve optimal properties of HEAs for various engineering applications. In conclusion, research in the fi eld of HEAs continues to expand our understanding of its potential for high-temperature applications. Overall, studies in this fi eld continue to open new horizons for creating materials with optimized properties for future technologies. Strength and Plasticity Properties of HEAs This section reviews the latest advances in developing and improving the strength and plasticity properties of HEAs, including methods of synthesis and processing, as well as the application of modern technological approaches and modeling. Development of New Alloys with Embedded High-Strength Properties The development of new alloys with embedded high-strength properties is actively underway. A lightweight, refractory alloy AlNb2TiV with a density of 6.19 g/cm³ and a specifi c yield strength of 167 MPa·cm³/g was proposed. The alloy demonstrates good deformability [50]. In another study, a matrix composite Re0.5MoNbW(TaC)0.5 was successfully synthesized from a HEA. The composite microstructure remained stable after annealing at 1,300 °C for 168 hours. It showed remarkable high-temperature strength, with a yield strength of about 901 MPa and a true compressive strength of about 1,186 MPa at 1,200°C [51]. The composite creates an ideal balance between ultra-high strength and high plasticity at elevated
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