OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 4 2024 process parameter control enables the production of alloys with specifi c microstructures and properties. In [5], a review of various alloys produced using laser additive manufacturing was conducted. It was noted that these alloys are characterized by rapid design and manufacture, as well as good thermophysical and mechanical properties. In [6], a CrMnFeCoNi HEA with outstanding wear-resistant and corrosion-resistant properties was produced using laser additive manufacturing and subsequent laser shock treatment. After laser treatment, the results showed a signifi cant improvement in performance. Specifi cally, the coeffi cient of friction and wear rate of the specimens were signifi cantly reduced. For example, the scratch height on the untreated specimen surface varied from 0 to 4.5 μm below the surface and up to 4.2 μm above it, while on the specimen treated with a 2 J laser, the height ranged from 0 to 4.2 μm below and up to 5.6 μm above the surface. At laser energies of 4 and 6 J, signifi cant ripple patterns and more pronounced microstructural changes were observed on the treated surfaces. Corrosion tests showed that the laser-treated specimens had lower corrosion current densities and higher corrosion potentials compared to untreated specimens, indicating improved corrosion resistance. Specifi - cally, the treated specimens exhibited a reduction in corrosion current to 0.1 μA/cm² and an increase in corrosion potential to −0.3 V, indicating the formation of denser passive fi lms capable of protecting the material from aggressive ions. The main conclusions of the work are that laser shock peening leads to the formation of a layer with increased microhardness and compressive residual stress, which in turn reduces wear and protects the material from corrosion. These improvements are due to grain refi nement and the creation of compressive residual stresses, which contribute to the formation of more durable passive fi lms. In a recent study conducted at the Siberian State Industrial University, an innovative arc surfacing method using fl ux-cored wire was discussed, off ering a new approach to HEAs fabricating. The method involves the use of specially designed fl ux-cored wires and high-silicon manganese fl ux for surfacing, allowing for the avoidance of issues associated with traditional powder methods. The study showed that the resulting metal primarily consists of iron and alloying elements, but certain challenges were identifi ed, such as the presence of non-metallic inclusions and relatively low hardness compared to equimolar HEAs. These results highlight both the potential and limitations of the new method, opening up prospects for further research and improvements in the fi eld of HEAs and its applications [7]. Alloying of High-Entropy Alloys One of the most promising methods for improving the properties of HEAs is alloying, a process of adding various elements to the base composition of the alloy. Alloying opens new possibilities for adapting HEAs to meet the specifi c requirements of diff erent industrial sectors. The authors will consider various properties of HEAs modifi ed by alloying. Alloying can signifi cantly infl uence the corrosion resistance of HEAs. Diff erent alloying elements can interact with the environment in various ways, leading to diff erent types of corrosion. In study [8], the eff ect of Mo on the microstructure, corrosion properties, and composition of the passive fi lm of cast AlCrFeNi3Mox (x = 0; 0.1; 0.2; 0.3; 0.4) was investigated. The Mo0.3 alloy has a corrosion rate of 0.0155 mm/year and exhibits superior corrosion resistance compared to the Mo alloy. The increased corrosion resistance is attributed to the superior protective properties of the passive fi lm with higher Cr2O3 content and embedded Mo oxides. In study [9], it was found that adding the appropriate amount of Co to replace Cr in the Fe35Ni20Cr20 alloy positively aff ects its corrosion resistance. Wear resistance improvement is achieved through alloying with boron [10], niobium [11], and tungsten carbide [12]. Alloying with boron (0.3 atomic percent) modifi es the microstructure and deformation mechanism of the alloy, leading to a 35-fold increase in wear resistance. The primary mechanism for this improvement is associated with the formation of nanostructured layers and changes in wear type under high loads. The study showed that adding niobium changes the alloy’s microstructure, signifi cantly increasing hardness and wear resistance but reducing corrosion resistance. Maximum wear resistance was observed at a niobium content of 1.5 mol. % while the wear coeffi cient decreased to 84 % at loads of 10 N and 20 N compared to the original alloy without niobium. Adding 5–20 % tungsten carbide (WC) to the CrFeCoNi
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