| Abstract Scope |
High-entropy alloys (HEAs) are new emerging materials that offer exceptional mechanical strength, remarkable ductility, thermal stability, and oxidation resistance. However, the high cost of bulk ingots limits their industrial applications. HEA coatings, as a cost-effective alternative, have the potential for widespread use. The Mo addition has been reported to promote the self-generation of lubricious oxides in bulk ingots, with reduced friction and wear. This study investigates CoCrFeNiMo0.5 HEAs coatings, evaluating their wear behaviours from room temperature to 1000 °C. Optimized printing strategies produced dense microstructures with strong metallurgical bonding to substrates. The wear rates of the coatings are significantly lower than those of their bulk counterparts. Comprehensive characterization of the worn surfaces and subsurface regions revealed temperature-dependent wear mechanisms. These findings demonstrate the potential of cold-spray HEA coatings for extreme environments and establish a foundation for advanced coating design in aerospace, automotive, and metallurgical industries. |