Abstrakt
An ongoing call for materials capable of operating at high temperatures has led to the development of numerous structural alloys such as Ni-based superalloys.
In recent years, much hope was also put into Complex concentrated alloys - alloys consisting of multiple elements. Our department developed equimolar alloy FeAlCrNiV possessing promising mechanical properties up to 800 °C. We focused on further characterization of its oxidation behavior. A series of
FeAlCrNixVy samples was made to examine in detail the effect of vanadium which seems to play a crucial role in the kinetics of the oxidation. Our findings have shown that vanadium, even in a reduced amount, deteriorates oxidation resistance of the material. Presumably, the formation of V2O5 impairs alumina and chromia scale and thus limits the resistance to high-temperature oxidation. Furthermore, the detailed characterization of the formed oxide scale revealed formation of complex oxides and presence of oxides in rare modifications.