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

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...

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Bibliographic Details
Published in:Journal of phase equilibria and diffusion 2015-02, Vol.36 (1), p.68-77
Main Authors: Miettinen, Jyrki, Vassilev, Gueorgui
Format: Article
Language:English
Subjects:
Aluminum
Assessments
Binary systems
Ceramics
Chromium
Composites
Crystallography and Scattering Methods
Engineering Thermodynamics
Glass
Heat and Mass Transfer
Iron
Mathematical models
Metallic Materials
Natural Materials
Niobium
Physics
Physics and Astronomy
Thermodynamics
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Summary: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 (Fe 7 Nb 6 ) has been modeled as (Fe,Nb) 7 (Nb) 6 , while Fe 2 P and FeNbP, have been modeled both as (Fe,Nb) 2 (P). All other phases (Fe 2 Nb, Fe 3 P, FeP, Nb 3 P, Nb 7 P 4 , NbP, NbP 2 , FeNb 2 P, FeNb 4 P, (P)) are treated as stoichiometric. The assessment of this system needs improvement but more experimental information has to be available.
ISSN:1547-7037
1863-7345
1934-7243
DOI:10.1007/s11669-014-0351-5