Elevated-temperature wear performance of AlCrNbMoV coating fabricated by laser cladding

Recent advances in materials science have shed light on the potential of refractory high-entropy alloys (RHEAs) to improve wear performance across varying temperatures. These alloys offer an optimal balance between strength and ductility, making them ideal for protective coatings. Despite the lightweight properties of Ti-6Al-4 V alloys, they still pose challenges when it comes to wear resistance. This study presents a lightweight coating using RHEAs made of AlCrNbMoV through laser cladding. Notably, the AlCrNbMoV coating exhibits a single-phase BCC structure and completes with diffuse regions enriched in titanium dendrites. In addition, the microhardness of the coating is measured at 792.4 (+/- 6.5) HV0.5, showing a remarkable improvement compared to TC4. The wear rate at 600 degrees C for the AlCrNbMoV coating is measured at 0.43(+/- 0.026)x10(-4)mm(3)/N/m, demonstrating a significant reduction of 91.43% when compared to the wear rate of TC4, which stands at 5.02(+/- 0.081)x10(-4)mm(3)/N/m. The wear mechanism undergoes a transition from abrasive wear at room temperature to adhesive wear at 300 degrees C and then to fatigue wear at 600 degrees C. The study introduces new possibilities for the application of RHEAs in protective coatings, particularly in high-temperature environments such as aerospace