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Thermodynamic Analysıs of the Fe -Co -N System and Predictive Approach to the Phase Diagram The thermodynamic properties of the Fe -Co -N system are poorly known from experiments and there ıs a need for information on the stability of its various phases, and the Fe -Co -N phase diagram. This type of information has now been obtained. The approach ıs based on the use of thermodynamic models and the construction of probable Gibbs energy (Gm) functions for the various phases in the system. The model parameters originating in the Fe-Co, Fe-N and Co -N systems are taken from recent analyses, whereas the purely ternary Grm Parameters are evaluated from experiments or are estimated. The estimation methods for stoichiometric nitrides rely on regularities in bonding properties and vıbrational entropy of 3d-transition metal compounds, and the estimatıons of excess Gibbs energy parameters make use of trends in the information for related systems. The new results are presented ın a table of thermodynamic parameters, ten calculated isothermal sections of the Fe-Co -N phase diagram for temperatures between 773 and 1673 K, the liquidus surface and the calculated N solubility in solid and liquid F

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Author

Armando Fernández Guillermet

Publisher

Walter de Gruyter GmbH

Published

1992

Field

Engineering (Physical Sciences)