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· Gibbs function versus composition
curves can be constructed for all the possible phases
of a binary alloy.
The curves show the Gibbs function v. Composition curves for these phases
at some temperature.
· At this
temperature, the α- and β-phases have the lowest Gibbs
free energy, and for
the compositions Xα< X0
< Xβ the alloy
separates into a mixture of two terminal solid
solution phases α + β.
· The
compositions Xα
and
Xβ are in thermodynamic
equilibrium because they have the same chemical
potential,
μ = (dG/dX).
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From:
Brophy, Rose, and Wulff.,
"Thermodynamics of Structure," Wiley
(1964)
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