Microstructural, Mechanical and Wear Properties of Atmospheric Plasma-Sprayed and High-Velocity Oxy-Fuel AlCoCrFeNi Equiatomic High-Entropy Alloys (HEAs) Coatings

Abstract In this investigation, atmospheric plasma spray (APS) and high-velocity oxy-fuel (HVOF) techniques were used to produce AlCoCrFeNi coatings. High-entropy alloys (HEAs), due their mechanical, chemical, physical properties are capturing the attention of international scientific community. Starting feedstock powders characterized in terms size, phase, corrosion test NaCl, ball on disk, rubber wheel, jet erosion tests was carried out obtained The results tribological investigation show that case APS coatings, wear behavior depend microstructure phases coating, as well amount oxides. particular, morphology surfaces is by brittle fracture, with presence pores, cracks, grooves. For HVOF further investigations process parameters needed because poor adhesion strength between coating substrate. Anyway, resistance greater than C steel substrate benchmark results, addition, it ensures better performances wheel tests, but its ball-on-disk worse debris remaining track.