In addition to the binary eutectics located on the binary edges of the diagrams in Fig. The cooling characteristics of phases in the ternary system can be described in a similar way to that previously discussed for binary systems. (A) and (B) Alternative representations of the ternary system A–B–C. It can be seen that ternary phases lie within the boundary of the diagram, illustrating the contribution of each of the components in the phase composition.įig. On the diagram, this composition can be fixed in several ways, but the simplest and often most convenient way is to plot the composition using percentages of only two of the components the third is automatically fixed by the geometry of the diagram. Additionally, the components can participate to provide ternary or three-component phases where the fractional contribution of all components must add up to unity, for example, a phase with the composition A 3BC 2 has 50% A, 16.7% B and 33.3% C. Each edge of the ternary diagram between pairs of end-members is a binary system in its own right, as is a vertical section between two compatible phases, and has all the normal properties of a binary system. But first, some explanation of interpreting compositions from ternary diagrams will be given. We shall therefore focus on isothermal sections, an example of which is illustrated in Fig. However, it is sometimes easier and more relevant to discuss isothermal sections of the complete diagram, particularly for subsolidus properties or, as is useful in some cases, a vertical section between two compatible phases.
A practical example of how to use this is given in Section 3.4.2 for the CaO–Al 2O 3–SiO 2 system. 3.5B) arrows on the bold phase field boundary lines indicate the direction of falling temperature, and double arrow where this becomes a reaction curve. The conventional way of expressing detail in the complete system is by the use of isothermal contour lines on the liquidus surface ( broken lines in Fig. 3.5A) rather than lines as in the binary system. However, in three dimensions the diagram is more complex with surfaces emerging ( Fig. Ternary diagrams represent three-component systems and are conveniently presented as triangular diagrams where each side corresponds to an individual binary system.
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