International audienceA deep knowledge of phase relationships involving a liquid phase is of critical interest in solidification process. If chemically active elements are involved, the conditions under which phase equilibria will be studied should be carefully defined. An illustration is given by the investigation of the Fe-rich corner of the Fe-Ti-B system between 1200 and 1450 A degrees C, for which Ti and B reactivity, very low solubility and flotation effects of TiB2 should be taken into account. The strategy is to combine both static and dynamic methods. Electromagnetic phase separation technique, developed at our laboratory, allows to determine phase field boundaries in the liquid/solid domains at selected temperatures and to locate univariant lines on a liquidus projection. Differential thermal analysis is supplemented by characterization of resulting microstructures to establish liquidus temperature of selected alloys and to evaluate ternary invariant points. These new experimental data may be used as a basis for a relevant thermodynamic description of the investigated ternary system
Abstract. In many cases of miscibility gap in ternary systems, one critical point at least, stable or metastable, can be observed under isobaric and isothermal conditions. The experimental determination of this invariant point is difficult but its knowledge is essential. The authors propose a method for calculating the composition of the invariant solution starting from the composition of the liquid phases in equilibrium. The computing method is based on the barycentric properties of the conjugate solutions (binodal points) and an extension of the straight diameter method. A systematic study was carried out on a large number of ternary systems involving diverse constituents (230 sets ternary systems at various temperatures). Thus the results are presented and analyzed by means of consistency tests.
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