Abstract
Univariant and invariant phase equilibria for systems that display second-order transformations such as chemical and magnetic ordering are arranged consistently aiming to construct complete Scheil’s reaction schemes. For this purpose it is assumed that univariant phase boundaries representing second-order (or higher-order) transformations are nothing else than phase fields collapsed into infinitely thin thickness. This implies that second-order transformations can be formally treated like first-order transformations. Adequate notations and representation guidelines are proposed for the Scheil’s scheme. Examples are given for binary Al-Fe and ternary Al-Fe-Ta systems using recently obtained thermodynamic descriptions.
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Notes
In accordance with Inden[4] there is no need to distinguish second-order from higher-order transformations in phase diagram calculations and representation due to their qualitatively similar contribution to the Gibbs energy. It is often sufficient to classify the transformations into first-order and continuous.
The continuous transitions are characterized by singularities in the thermodynamic functions that in phase diagrams occur at critical points or along critical lines or surfaces.[5]
According to this description, a miscibility gap occurs between Heusler L21 (Fe2TaAl) phase and its D03 (Fe3Al) limitrophe. The Thermo-Calc software starts to label it as L21#2 and L21#1, respectively, according to distinct composition sets. To improve the readability of the reaction scheme and of relevant figures, we replaced L21#1, which has tiny solubility of Ta, with D03 and L21#2 with L21.
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Acknowledgments
The authors gratefully acknowledge Dr. S. Rex for fruitful discussions. This work was supported by the German Federal Ministry of Research (Contract FKZ 50WM0843).
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Witusiewicz, V.T., Bondar, A.A., Hecht, U. et al. Phase Equilibria in Binary and Ternary Systems with Chemical and Magnetic Ordering. J. Phase Equilib. Diffus. 32, 329–349 (2011). https://doi.org/10.1007/s11669-011-9910-1
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DOI: https://doi.org/10.1007/s11669-011-9910-1