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·
On
lines of two phase equilibrium, either the pressure may be selected and
then the equilibrium temperature is constrained, or the temperature may
be selected and then the pressure is constrained.
· The
points (g) (h) correspond to (T, p) states for which three phases coexist
in thermodynamic equilibrium: i.e. "triple points." For these: C
= 1, P
= 3 so that: F
= {1 - 3 + 2} = 0 . The system has no
degrees of freedom and is, therefore, fully constrained.
· The
same Gibbs phase rule considerations apply to systems with more than one
component. The two component (C
= 2) Copper
- Nickel system will be used to illustrate application of the Gibbs
phase rule to binary alloys. |
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