Metall. Res. Technol.
Volume 115, Number 5, 2018
|Number of page(s)||8|
|Published online||23 October 2018|
Thermodynamic assessment of Hafnium Iridium binary system
Centre Régional des Métiers de l’Éducation et de la formation,
2 Laboratoire Génie de l’Énergie, Matériaux et Systèmes, ENSA, Université Ibnou Zohr, BP 1136 Agadir, Maroc
3 Laboratoire de Physicochimie de l’État Solide, ICMMO, Université Paris-Sud, 91405 Orsay Cedex, France
* e-mail: email@example.com
Accepted: 2 January 2018
The Hf–Ir system has been thermodynamically modeled by the CALPHAD approach. Hf2Ir, αHfIr, βHfIr, γHfIr (high temperature phase) and HfIr3 which have a homogeneity range, were treated as the formula (Hf,Ir)x:(Ir,Hf)1−x by a two-sublattice model with a mutual substitution of Hf and Ir in both sublattices.Hf5Ir3 has been treated as a stoichiometric compound while a solution model has been used for the description of the FCC (Ir) solid solution. Additionally, two different models describing the excess Gibbs energy for the liquid and for the solid solutions (BCC, FCC and HCP) were used and their predictions are compared. The calculations based on the thermodynamic modeling are in good agreement with the phase diagram data and experimental thermodynamic values available in the literature.
Key words: thermodynamic assessment / thermodynamic modeling / Hf-Ir system / Calphad method / phase diagram
© EDP Sciences, 2018
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