Thermodynamic description of ternary Fe–B–X systems. Part 8 : Fe–B–Mo, with extension to quaternary Fe–B–Cr–Mo system
Miettinen, Jyrki; Visuri, Ville-Valtteri; Fabritius, Timo (2020-12-22)
Miettinen, Jyrki; Visuri, Ville-Valtteri; Fabritius, Timo (2020) Thermodynamic description of ternary Fe–B–X systems. Part 8 : Fe–B–Mo, with extension to quaternary Fe–B–Cr–Mo system. Archives of Metallurgy and Materials 66(1), pp. 281-295, https://doi.org/10.24425/amm.2021.134786
© 2020. The Author(s). This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCom-mercial License (CC BY-NC 4.0, https://creativecommons.org/licenses/by-nc/4.0/deed.en which permits the use, redistribution of the material in any medium or format, transforming and building upon the material, provided that the article is properly cited, the use is noncommercial, and no modifications or adaptations are made.
https://creativecommons.org/licenses/by-nc/4.0/
https://urn.fi/URN:NBN:fi-fe202103107000
Tiivistelmä
Abstract
Thermodynamic optimizations of the ternary Fe-B-Mo system and its binary sub-system B-Mo are presented. The Fe-B-Mo description is then extended to the quaternary Fe-B-Cr-Mo system by assessing the ternary B-Cr-Mo system. The thermodynamic descriptions of the other binaries (Fe-B, Fe-Cr, Fe-Mo, B-Cr, and Cr-Mo) and the other ternaries (Fe-B-Cr and Fe-Cr-Mo) are taken from earlier studies. In this study, the adjustable parameters of the B-Mo, Fe-B-Mo, and B-Cr-Mo systems were optimized using the experimental thermodynamic and the phase equilibrium data from the literature. The solution phases of the system (liquid, bcc and fcc) are described with the substitutional solution model, and most borides are treated as stoichiometric phases or semistoichiometric phases, using a simple two-sublattice model for the latter. The system’s intermetallic phases, Chi, Mu, R, and Sigma (not dissolving boron) as well as boride M₃B₂, based on a formulation of (Cr,Fe)(Cr,Fe,Mo)₂(B)₂, are described with a three-sublattice model. Reasonable agreement is obtained between the calculated and measured phase equilibria in all four systems: B-Mo; Fe-B-Mo; B-Cr-Mo; and Fe-B-Cr-Mo.
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