Abstract
Thermodynamic description of the Fe-Ni-P system is 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-Ni and Fe-P, are taken from earlier assessments. Those of the Ni-P and the Fe-Ni-P systems are optimized in this study using literature experimental thermodynamic and phase equilibria data. The solution phases of the ternary system (liquid, bcc_A2 and fcc_A1) are described with the substitutional solution model. The most of the phosphides (FeP, Ni5P2-H, Ni5P2-L, Ni12P5-H, Ni12P5-L) as well as the white-P-phase are treated as stoichiometric. Continuous solubility has been accepted between the two couples of isomorphic phases: Fe3P and Ni3P, and Fe2P and Ni2P. Good or reasonable correlation was obtained between the calculated and the experimental thermodynamic and phase equilibrium data.
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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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Miettinen, J., Vassilev, G. Thermodynamic Description of Ternary Fe-X-P Systems. Part 6: Fe-Ni-P. J. Phase Equilib. Diffus. 36, 78–87 (2015). https://doi.org/10.1007/s11669-014-0358-y
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DOI: https://doi.org/10.1007/s11669-014-0358-y