Chapter8_lecture-1

Chapter8_lecture-1 - Chapter 8 Kinetics of Microstructural...

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Unformatted text preview: Chapter 8 Kinetics of Microstructural Transformations Structural transformations Driving force Homogeneous nucleation Heterogeneous nucleation Homogeneous Nucleation At T m , the liquid and the solid have the same energy and coexist Above (to the right of) T m , the liquid exists because the energy of the liquid is lower Below (to the left of) T m , the solid exists because the energy of the solid is lower Gibbs Free Energy, G V T G V s G V l T T m Solidification of a Pure Substance- Driving Force for the Transformation Gibbs Free Energy, G V Temperature, C G V s G V l T G V lhs T m Driving Force for Solidification of a Pure Substance l s s l V V V l s l s l s V V V m l s V l s l s V V m G G G G H T S At T T G H S T =- = - = = = 1 l s p l s l s l s V V V m l s l s V V m l s l s m V V m l s l s V V m For any T when c H G H T T T G H T T T G H T H G T T = = - = - - = = Homogeneous Nucleation Liquid Solid Homogeneous Nucleation Liquid Solid Homogeneous Nucleation Solid Solid Liquid...
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Chapter8_lecture-1 - Chapter 8 Kinetics of Microstructural...

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