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Chapter 10 notes - C hapter 10 Phase T ransformations How...

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Chapter 10 – Phase Transformations How does rate of transformation depend on time and temperature? Is it possible to slow down transformations so that non equilibrium structures are formed? Nucleation Nuclei seeds act as templates on which crystals grow For nucleus to form rate of addition of atoms to nucleus must be faster than rate of loss Once nucleated, growth proceeds until equilibrium is attained Driving force to nucleate increases as we increase temperature Supercooling – eutectic, eutectoid o Small supercooling->slow nucleation rate – few nuclei – large
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