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Thermodynamic investigations in the Al–Fe system: Thermodynamic modeling using CALPHAD

Maximilian Rank , Peter Franke and Hans Jürgen Seifert


The Al–Fe system has been modeled and optimized with the CALPHAD approach. Heat capacity values from three intermetallic phases (stoichiometric compositions: Al2Fe, Al5Fe2 and Al13Fe4) were experimentally determined and implemented into the Gibbs energy descriptions, thus the estimated heat capacity from Neumann–Kopp is substituted. From these results together with new literature values, a revised dataset of the binary Al–Fe system is presented. Based on the Compound Energy Formalism, the homogeneity range of the Al2Fe and Al5Fe2 phase is represented using a two-sublattice model. In addition, the Al8Fe5 phase has been modeled with a four-sublattice model and the number of sublattices of the Al13Fe4 phase has been changed from a three-sublattice model to a two-sublattice model. The critically assessed parameters provide a consistent thermodynamic dataset and represent most of the relevant thermochemical data as well as phase diagram data within their experimental uncertainties.

Correspondence address, Maximilian Rank, Institute for Applied Materials – Applied Materials Physics, Karlsruhe Institute of Technology, Hermann-von-Helmholtz-Platz 1, Eggenstein-Leopoldshafen 76344, Germany, Tel.: +49 721 608 28542, E-mail: , Web:


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Received: 2018-06-28
Accepted: 2018-11-19
Published Online: 2019-05-17
Published in Print: 2019-05-15

© 2019, Carl Hanser Verlag, München

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