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O.B. MEL’NYK, A.B. SHEVCHENKO, and O.V. OLIINYK

Thermodynamic Modelling of Structural Transformations in High-Entropy NiTiCoCuZrHf Alloys
1001–1011 (2024)

PACS numbers: 05.10.Ln, 05.70.Ce, 65.40.De, 65.40.gd, 81.30.Bx, 81.30.Kf, 82.60.-s

The compositions for high-entropy alloys containing Ni, Ti, Co, Cu, Zr, Hf elements are considered using a thermodynamic approach within the framework of the semi-empirical Miedema’s theory. The compositions of alloys with the minimum Gibbs free energy, which will be in the form of single-phase stable solid solutions, are calculated. As found, the single-phase stable solid solutions will differ significantly from the equimolar stoichiometry, and the equiatomic high-entropy alloys will be multiphase. The parameters of martensitic transformations are estimated, and their correlation with experimental data is revealed. The obtained results are used to interpret the elastocaloric effect in the studied systems

KEY WORDS: high-entropy alloys, solid solution, Gibbs energy, martensitic transformations

DOI:  https://doi.org/10.15407/nnn.22.04.1001

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