· The diagrams below indicate phase transitions involving homogeneous (left) or heterogeneous nucleation.
· TE is the equilibrium temperature at which the α and β -phases can coexist. · Gα(T)and Gβ(T) are their Gibbs functions. · Homogeneous nucleation starts in the bulk of the first phase. Inhomogeneous nucleation starts at grain boundaries, surfaces, or dislocations.