STRUCTURE AND PROPERTIES OF CANTOR FeCoCrNiMn HEA WELDED ON 5083 ALLOY

10.25712/ASTU.1811-1416.2022.02.008

Abstract

The beginning of the 21st century is marked by the attention of scientists in the field of physical materials science to the creation and study of coatings from high-entropy alloys. Using the technology of wire-arc additive manufacturing (WAAM), a coating of high-entropy Cantor alloy FeCoCrNiMn of non-equiatomic composition was formed on a 5083 aluminum alloy substrate. Using the methods of modern physical materials science, the analysis of the structure, elemental composition, microhardness, and wear resistance of the "coating-substrate" system was carried out. It has been established that the deposition of the HEA FeCoCrNiMn coating on the surface of the 5083 alloy is accompanied by the formation of microhardness and elemental composition gradients. The presence of microcracks and micropores was revealed in the cross section of the coating. It is shown that the microhardness in the bulk of the coating is 2.5-3.5 GPa and increases to 9.9 GPa at the boundary with the substrate. In the middle part of the coating, the wear factor is 2.3·10^-4 mm³/N·m, the friction coefficient is 0.7. A transition layer up to 450 µm thick is formed at the interface between the coating and the substrate. The gradient of the elemental composition of the transition layer was analyzed and a high level of chemical homogeneity of the coating was noted. The fact of coating doping with substrate elements (aluminum), which leads to the formation of FeCoCrNiMnAl HEA, is established, and it is shown that coating doping with substrate elements leads to the formation of a lamellar structure at the interface between the transition layer and the substrate.