As a novel metallic material, high‐entropy alloys have garnered significant attention from researchers due to their exceptional mechanical properties. In this study, Co 33.5 Cr 20 Ni 33.5 Al 5 Ti 3 W x (x = 0, 3, 5, 7, 9) high‐entropy alloys with varying tungsten contents were manufactured through the vacuum arc melting method. The impact of tungsten content on the alloys’ structure, mechanical properties, and high‐temperature oxidation resistance was examined using x‐ray diffraction and scanning electron microscope. Results show that the oxidation resistance of Co 33.5 Ni 33.5 Cr 20 Al 5 Ti 3 W x high‐entropy alloys decreases initially, followed by an increase and ultimately a drop with increasing tungsten content. The most optimal oxidation resistance is observed in alloys with x = 0 and 7 (0.45 mg·cm −2 , 0.62 mg·cm −2 ). Adding more tungsten increases fracture strength, plastic strain, and microhardness. The superior mechanical properties of Co 33.5 Ni 33.5 Cr 20 Al 5 Ti 3 W 5 alloy (740 MPa) stem from tungsten‐induced solid solution strengthening and grain refinement, with higher tungsten content enhancing ductility while maintaining high strength. These findings provide valuable insights for future researchers in designing components, controlling microstructure, and developing properties of high‐entropy alloys.
Liu et al. (Tue,) studied this question.