THERMODYNAMIC MODELING OF HIGH-TEMPERATURE OXIDATION OF AlxCoCryNiNbz HIGH-ENTROPY ALLOYS
Samoilova O.V.(1), Pratskova S.E.(1,2), Bilgenov A.S.(1)
(1) South Ural State University
454080, Chelyabinsk, Lenin ave., 76
(2) Chelyabinsk State University
454001, Chelyabinsk, Bratiev Kashirinyh st., 129
High-entropy alloys (HEAs) consist of five or more elements in near-equiatomic ratios to achieve maximum configurational entropy of mixing. This concept allows designing a wide variety of compositions and can assist in obtaining materials with unique characteristics. It is known that AlxCoCryNiNbz type HEAs exhibit an optimal combination of strength and ductility and can be used to produce critical components for shipbuilding or aerospace industries [1]. For aerospace applications, the parts are constantly exposed to elevated temperatures. Therefore, niobium-containing HEAs are of particular interest for research into high-temperature oxidation resistance.
Thermodynamic modeling of the high-temperature oxidation process of alloys can optimize and significantly contribute to research in this field. This modeling is performed using the Calphad methodology, for which we applied the FactSage software package (version 7.3). We used data from the SGTE (2011) database to model the metallic phases, and the FToxid database, supplemented by FactPS data, to model the oxide phases. An example of the results of this calculation is shown in the figure below.
Results of thermodynamic modeling of high-temperature oxidation
of AlCoCrNiNb0.2 HEA at 1100 °C
1. Pan B., Xu X., Yang J., Zhan H., Feng L., Long Q., Yao Q., Deng J., Cheng L., Lu Z., Zhou H. Effect of Nb, Ti, and V on wear resistance and electrochemical corrosion resistance of AlCoCrNiMx (M=Nb, Ti, V) high-entropy alloys // Mater. Today Commun. 2024. Vol. 39. P. 109314. https://doi.org/10.1016/j.mtcomm.2024.109314
The study was supported by the Russian Science Foundation and the Government of the Chelyabinsk region, project No. 25-23-20049, https://rscf.ru/project/25-23-20049/