OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 4 2024 The main achievement of the study was a signifi cant improvement in the alloy tensile strength at room temperature due to the application of the ultrasonic surface rolling method. This process was carried out on a self-assembled platform, allowing precise control of the processing parameters and ensuring high reproducibility of the results (fi g. 5). Ultrasonic surface treatment improves the material mechanical properties by reducing microporosity and enhancing grain boundary adhesion, which is crucial for its electrical conductivity properties. Fig. 5. Electropulse ultrasonic surface rolling process diagram [70] Magnetic properties of HEAs are one of the most interesting and poorly studied areas in materials science. One factor infl uencing the magnetic properties of HEAs is its atomic structure. The study showed that the CoCuFeMnNi alloy obtained using mechanical alloying and spark plasma sintering methods exhibits signifi cant magnetic properties, including high saturation induction and low coercive force under given magnetic conditions. These characteristics make the CoCuFeMnNi alloy a promising material for application in the fi eld of soft magnetic technology [71]. In another study [72], manganese was replaced by chromium in the high-entropy FeCoNiAlMn alloy, which signifi cantly aff ected its magnetic properties. The best results are achieved at a certain concentration of chromium, at which a signifi cant increase in saturation induction is observed. Specifi cally, the FeCoNiAlMn0.4Cr0.6 alloy demonstrates optimal magnetic characteristics, making it a promising candidate for soft magnetic technology. This eff ect is related to changes in microstructure and crystallite sizes depending on Cr content, which infl uences the alloy magnetic properties. The study of the electrical and magnetic properties of HEAs highlights its potential for creating materials with unique characteristics for electrical and magnetic applications. The infl uence of alloy composition, thermal treatment, and pressure on electrical conductivity is actively researched, opening up ways to control its electrical conductivity. In the fi eld of magnetic properties, it has been revealed that the CoCuFeMnNi alloy exhibits high saturation magnetization and low coercive force, making it promising for soft magnetic technology. Optimization of the alloy microstructure and composition, including the replacement of manganese with chromium, also helps to improve its magnetic properties. Prospects for the Application of High-Entropy Alloys Despite a signifi cant number of studies, HEAs remain a promising topic for research due to its unique properties, such as high strength, corrosion resistance, wear resistance, and others. Moreover, these alloys have great potential for use in various industries. Chinese researchers see a great future for these alloys in the energy sector, particularly in the creation of supercapacitors, new electrode
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