Improved lead-bismuth eutectic corrosion resistance and mechanical properties of reactive gas pulse sputtered AlCrFeMoTi/(AlCrFeMoTi)N composite multilayered high-entropy alloy coatings

Abstract

The (HEA/HEAN)-n multilayer coatings consisting of alternating (AlCrFeMoTi)N (top) and AlCrFeMoTi layers were specially designed and successfully deposited on 12Cr2W2Mn F/M steel substrate by reactive magnetron sputtering technology. The dependence of microstructure, mechanical properties and lead-bismuth eutectic (LBE) corrosion resistance on interlayer interface density was systematically investigated. The multilayer structure design improved the mechanical properties and high-temperature structural stability of the multilayer coatings. Furthermore, after exposed to LBE at 650 °C for 1000 h, the (HEA/HEAN)-12 multilayer coatings with optimum interlayer interface density exhibited the most optimal LBE corrosion resistance. The oxidation corrosion mechanism of the (HEA/HEAN)-n multilayer coatings were also discussed intensively.