Ultrasonic Cavitation Erosion Behavior of CoCrxFeMnNi High-Entropy Alloy Coatings Prepared by Plasma Cladding

CoCrxFeMnNi (x represents the atomic percentage of Cr element, x = 20, 25, 30, and 35, denoted as Cr20, Cr25, Cr30, Cr35 alloys) high-entropy alloy (HEA) coatings were cladded by plasma arc on surface 0Cr13Ni5Mo steel. The effects elements cavitation erosion mechanisms studied comparing differences microstructure, microhardness, volume loss (CVL), rate (CER), eroded morphologies between coatings. As content increased, microhardness increased continuously, microstructure transformed into fine dendrites. microhardnesses 223.9 HV, 250.5 265.2 333.7 respectively. With structural change, slip pattern shifted from uniform distribution to along grain boundary, increasing resistance. Additionally, strain hardening capacity with reduced stacking fault energy (SFE). resistance (CR) HEA increase in content. CVL 20 h coating was only 26.84% that steel, peak CER 28.75% fracture damage four an obvious lamellar structure fibrous fracture.