Formation Enthalpy and Phase Behavior of Fe–Al–Ni Alloys: A Thermodynamic and Theoretical Spectroscopic Study

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Abstract:

Thermodynamic behavior and phase stability of binary and ternary alloy systems containing Fe, Al, and Ni are systematically investigated. Formation enthalpies (ΔH) of solid solutions and intermetallic compounds in the Fe–Al, Fe–Ni, Al–Ni, and Fe–Al–Ni systems were calculated using Miedema’s semi-empirical model implemented in the Materials Analysis Applying Thermodynamics (MAAT) software. Overall, the results indicate that solid solutions in the binary systems are thermally stable, and when the concentration of alloying elements is increased, solids solutions demonstrate a low change in thermal behavior while compounds exhibit more complex thermodynamic behavior and require higher energy for formation. The ternary Fe–Al–Ni system also exhibits exothermic and endothermic reactions according to the molar ratio of elements. The electronic and vibrational properties of the Fe₈₀Al₁₅Ni₅ alloys are theoretically simulated using DFT and TD-DFT for UV–Visible calculations, and the spectroscopic features are interpreted in correlation with the thermodynamic stability predicted by Miedema’s semi-empirical model. No experimental spectroscopic measurements were performed in this study.

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Materials Science Forum (Volume 1199)

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57-71

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August 2026

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© 2026 Trans Tech Publications Ltd. All Rights Reserved

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