Thus, three-phase equilibrium in a ternary system exists within a certain temperature range.Ħ. Three-phase equilibrium in a ternary system exists _Ĭlarification: When there are three phases in equilibrium in a ternary system under constant pressure, there is still one degree of freedom left. And the most important thing is, these tie-lines only have meaning in two-phase region were chemical potentials of both phases are fixed along the line.ĥ. Violation of the statement will directly lead to the violation of Gibbs phase rule. No two tie-lines at the same temperature may ever cross.Ĭlarification: The above mentioned statement is true. At the composition temperature, the tie line is drawn horizontally from one phase to another. A tie line is actually drawn on the phase diagram to speculate and determine the fraction of each component or mass fraction of each element. Which of the following is true about the direction of tie-lines?Ī) They must run from liquidus to solidusī) They must run from solidus to liquidusĬ) They can run from solidus to liquidus and vice versaĬlarification: They must run from the liquidus to solidus. If this is done for all possible compositions the points trace out the free energy surfaces for all the possible phases.ģ. The chemical potentials of A, B and C in any phase are then given by the points where the tangential plane to the free energy surfaces intersects the A, B and C axes in a Gibbs triangle.(Where A, B and C are individual components).Ĭlarification: The Gibbs free energy of any phase can be represented by a vertical distance from the point in the Gibbs triangle. The composition of a ternary alloy can be indicated on a _Ĭlarification: The composition of a ternary alloy can be indicated on an equilateral triangle (the Gibbs triangle) whose corners represent 100% the individual components.Ģ. Phase Transformation Multiple Choice Questions & Answers (MCQs) on “Ternary Equilibrium”.ġ.
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