Abstract
Thermodynamic descriptions of the Fe-Al-P system and its binary sub-systems, Fe-Al and Al-P, are developed in the frame of a new Fe-X-P (X = Al, Cr, Cu, Mn, Mo, Nb, Ni, Si, Ti) database. The thermodynamic parameters of the binary Fe-P system are taken from an earlier assessment and those of the Fe-Al, Al-P and Fe-Al-P systems are modified (Fe-Al, Al-P) or optimized (Fe-Al-P) in this study, using experimental thermodynamic and phase equilibrium data from the literature. The solution phases of the system (liquid, bcc_A2 and fcc_A1) are described with the substitutional solution model. The compounds are treated either as stoichiometric (Al5Fe4, Al2Fe, Al5Fe2, Al13Fe4, FeP, AlP) or as semi-stoichiometric phases (Fe3P and Fe2P). Good or reasonable correlation has been obtained between the calculated and the experimental thermodynamic and phase equilibrium data.
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Acknowledgments
Financial support from the Finnish Funding Agency for Technology and Innovation (TEKES) is gratefully acknowledged by Dr J. Miettinen and Prof. S. Louhenkilpi. The research was carried out as part of the Finnish Metals and Engineering Competence Cluster (FIMECC)’s SIMP program.
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Miettinen, J., Louhenkilpi, S. & Vassilev, G. Thermodynamic Description of Ternary Fe-X-P Systems. Part 9: Fe-Al-P. J. Phase Equilib. Diffus. 36, 317–326 (2015). https://doi.org/10.1007/s11669-015-0383-5
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DOI: https://doi.org/10.1007/s11669-015-0383-5