OBRABOTKAMETALLOV MATERIAL SCIENCE Vol. 26 No. 4 2024 high-entropy alloy signifi cantly improves its mechanical properties. The alloy’s hardness increases, and its corrosion resistance and wear resistance are enhanced. Particularly eff ective was the addition of 20 % WC, which resulted in a signifi cant increase in overall corrosion resistance and a wear reduction of approximately 4.5 times. For better comparison, the research results are presented in a Table 1. This table provides data on the wear rate of various HEAs before and after alloying. These data allow us to evaluate the eff ectiveness of alloying in improving the wear resistance of HEAs. Ta b l e 1 Wear rate of high-entropy alloys before and after alloying High entropy alloy Metal for alloying Characteristics before alloying Characteristics after alloying Load, N Wear rate, mm 3/ (N·m) Load, N Wear rate, mm3/(N·m) CoCrFeNi [10] B 2 2.6 × 10−5 2 8.3 × 10−6 5 2.9 × 10−5 5 8.6 × 10−5 8 3.57 × 10−4 8 8.9 × 10−5 AlCr2FeCoNi [11] Nb 5 18.7 × 10−6 5 5.2 × 10−6 10 46.8 × 10−6 10 6.5 × 10−6 20 40 × 10−6 20 6.2 × 10−6 CrFeCoNi [12] W 5 1.7 × 10−4 5 3.8 × 10−5 From the data presented, it can be seen that alloying signifi cantly improves the wear resistance of HEAs. For example, for CoCrFeNi alloy, alloying with boron (B) reduced the wear rate from 2.6 × 10⁻⁵ to 8.3 × 10⁻⁶ mm³/(N m) under 2 N load. Similarly, adding niobium (Nb) to the AlCr2FeCoNi alloy signifi cantly reduced the wear rate from 18.7 × 10−6 to 5.2 × 10−6 mm³/(N·m) under 5 N load. Adding tungsten (W) to CrFeCoNi also showed a signifi cant reduction in the wear rate from 1.7 × 10−4 to 3.8 × 10−5 mm³/(N m) under 5 N load. These results confi rm that alloying is an eff ective method for enhancing the wear resistance of high-entropy alloys, making it more suitable for use under conditions of high loads and intense wear. Alloying high-entropy alloys with elements such as Nb [13], La [14], Y [15] signifi cantly improves its thermal stability by altering the microstructure and chemical composition. These elements promote the formation of thermodynamically stable phases and protective oxide fi lms, which prevent grain growth, reduce atomic diff usivity, and protect the material from oxidation and corrosion. As a result, HEAs become more resistant to high temperatures and aggressive operating conditions, expanding its applications in various high-tech industries, such as aerospace, energy, and automotive industries. A study on the temperature dependence of the mechanical properties of Co20Cr20Fe20Mn20Ni20, Co19Cr20Fe20Mn20Ni20C1, and Co17Cr20Fe20Mn20Ni20C3 alloys in the range of 77 to 473 K, conducted by scientists from Tomsk [16], revealed that carbon alloying signifi cantly aff ects its structural and mechanical characteristics. Alloying leads to an increase in the lattice parameter of the austenitic phase, an increase in the yield strength, and a strengthening of the temperature dependence of strength due to solid solution, grain boundary, and dispersion strengthening, especially in the heterophase alloy Co17Cr20Fe20Mn20Ni20C3. While single-phase alloys demonstrate improved mechanical properties and plasticity at low temperatures, the heterophase alloy becomes more brittle, despite an increase in strength. Alloying HEAs with elements such as titanium (Ti) [17], aluminum (Al) [18], and neodymium (Nd) [19] plays a key role in improving its strength properties. Titanium contributes to increased hardness and deformation resistance, aluminum improves thermal stability and corrosion resistance, and adding neodymium enhances mechanical characteristics such as strength and ductility. These improvements make
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