Tribological and Thermodynamic Properties of the High Entropy Alloys CrMnFeCoNi and CuCrMnFeCoNi, Their Stability, and Structure Prediction

High-entropy coatings based on 3D metals have a unique combination of strength and ductility over a wide temperature range and can be obtained using vacuum ion-plasma magnetron sputtering technology. However, the model calculations of the thermomechanical properties of such alloys are complicated by a lack of stable and equilibrium lattices with complete structural information. This article implements prediction of the stability of the phases of an equiatomic high-entropy coating of CrMnFeCoNi by the inverse convex hull method. The thermodynamic and mechanical properties were determined. It was found that, up to room temperature, the medium-entropy, 4-element alloy of composition MnFeCoNi also belongs to the stable phases.