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Thermodynamic Description of Ternary Fe-X-P systems. Part 5: Fe-Nb-P

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Abstract

Thermodynamic descriptions of the Fe-Nb-P system and its binary sub-system, Fe-Nb, 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 sub-systems, Fe-P and Nb-P, are taken from earlier assessments and those of the Fe-Nb-P and Fe-Nb systems are optimized in this study using literature experimental thermodynamic and phase equilibrium data. The solution phases of the system (i.e. bcc_A2, fcc_A1, Liquid) are described with the substitutional solution model. The phase Mu (Fe7Nb6) has been modeled as (Fe,Nb)7(Nb)6, while Fe2P and FeNbP, have been modeled both as (Fe,Nb)2(P). All other phases (Fe2Nb, Fe3P, FeP, Nb3P, Nb7P4, NbP, NbP2, FeNb2P, FeNb4P, (P)) are treated as stoichiometric. The assessment of this system needs improvement but more experimental information has to be available.

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Acknowledgment

Financial support of the Finnish Funding Agency for Technology and Innovation (TEKES) is gratefully acknowledged by Dr J. Miettinen. The research was carried out as part of the Finnish Metals and Engineering Competence Cluster (FIMECC)’s SIMP program.

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Authors and Affiliations

  1. School of Chemical Technology, Aalto University, Espoo, Finland

    Jyrki Miettinen

  2. Faculty of Chemistry, University of Plovdiv, 24 Tsar Asen str, 4000, Plovdiv, Bulgaria

    Gueorgui Vassilev

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Correspondence to Gueorgui Vassilev.

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Miettinen, J., Vassilev, G. Thermodynamic Description of Ternary Fe-X-P systems. Part 5: Fe-Nb-P. J. Phase Equilib. Diffus. 36, 68–77 (2015). https://doi.org/10.1007/s11669-014-0351-5

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  • DOI: https://doi.org/10.1007/s11669-014-0351-5

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