What drives polymorphism in metal alloys?

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Polymorphism in metal alloys is primarily driven by the differences in free energies of various phases at specific temperatures. Changes in crystal structures, such as those seen in iron phases like alpha-ferrite, gamma-austenite, and delta-ferrite, occur as temperature varies. The stability of each phase is influenced by thermal energy, which affects atomic arrangements. Understanding these transformations is crucial for applications in materials science and engineering. The interplay of temperature and free energy is essential in explaining polymorphic behavior in alloys.
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I was wondering what the driving force behind polymorphism is. What causes polymorphic materials to change crystal structures at certain temperatures? Such as the iron phases alpha-ferrite, gamma-austenite, delta-ferrite, hexaferrum?
 
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The driving force for poly morphism in metal alloys is difference in free energies of two phases at different temperatures
 

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