How to draw the Isothermal Section of a Ternary Phase Diagram

  • Thread starter Gelate
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Professor is now teaching us to draw isothermal sections of a Ternary Phase Diagram...

Isothermal Section: A “horizontal” section of a ternary phase diagram obtained by cutting through the space diagram at a specified temperature

I am so confused... I have big trouble in picturing the isothermal section at a temperature with 3-phase region.

e.g., I can draw isothermal sections of a ternary eutectic system if the temperature is above the ternary eutectic point (i.e., only have 2-phase regions); but at a lower temperature I know there is a 3-phase region without knowing how to draw it! (its shape, location???...).

For more complicated Ternary Phase Diagrams, I find it even harder, because there will be more than one 3-phases regions, or even 4-phases region. I just cannot understand where and how many these multiple phases' regions are.

Could anyone give me some advice? Maybe there is some tips or tricks?
 

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