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In most systems the α and β phases have such different crystal structures that it is impossible to form coherent low-energy interfaces and homogeneous nucleation of the equilibrium β phase is then impossible.

In most systems the α and β phases have such different crystal structures that it is impossible to form coherent low-energy interfaces and homogeneous nucleation of the equilibrium β phase is then impossible. Correct Answer True

Even though this scenario exists, it is often possible to form a coherent nucleus of some other, metastable phase (β’) which is not present in the equilibrium phase diagram. The most common example of this is the formation of GP zones.

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