Evaluation of high temperature oxidation resistance of AlCoCrFeNiZr high-entropy alloy (HEA) coating system at 1000 °C and 1100 °C

Powder metallurgy was used to create the high entropy alloy (HEA) AlCoCrFeNiZr powder alloy stoichiometrically (1 mol of each element). Then, using HVOF and APS techniques, CoNiCrAlY with HEA properties and the synthesized AlCoCrFeNiZr were deposited on Inconel 718. To examine its applicability in aerospace components exposed to high operating temperatures, the resulting AlCoCrFeNiZr-HEA coating system was put through isothermal oxidation tests at intervals of 1000 degrees C and 1100 degrees C and 5-100 h. Following the tests, the coating system momentarily changed to a rhombohedral lattice with 74 % atomic occupancy at 1100C. Following this change, there was no breakage or fragmentation and the coating system's resistance to oxidation increased. Furthermore, the TGO thickness was determined to be 2.124 mu m f 0.3 and 2.569 mu m f 0.3, respectively, following 100 h of oxidation at 1000 degrees C and 1100 degrees C temperatures.