FEATURES OF HIGH-TEMPERATURE OXIDATION OF HIGH-ENTROPY AlCrFe3CoNiCu ALLOY

The paper examines how the scale forms on the AlCrFe3CoNiCu alloy when oxidized at 900 degrees C for 50 h and how high-temperature annealing influences the structure and phase transformations and mechanical properties of the alloy matrix. It is found that long-term annealing at 900 degrees C leads to the formation of a three-phase alloy consisting of a solid solution with a BCC lattice of B-2 structural type and two solid solutions with FCC crystal lattices (one contains a higher amount of Ni and Co, and the other is a solid solution enriched with 66 wt. % Cu). A two-phase scale containing Al(2)O(3)and CuO forms on the alloy in the oxidation process. Indentation method has shown that the mechanical properties of the AlCrFe3CoNiCu alloy remain stable after long-term high-temperature annealing.