Lecture 422014.pdf

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Department
Materials Science
Course
MATS 3011
Professor
Bharat Jalan
Semester
Spring

Description
Lecture 422014Wednesday April 2 2014231 PMPhase TransformationExample Eutectoid reaction in FeC phase diagramPhase transformation can be broken into 2 steps1 Nucleation2 GrowthNucleationStart with some type of phase lets say liquidconsider first a phase change like nucleation of a spherical solid particle in liquid3volume of particle43pir2solidliquid interface area4pir32Total change in Gibbs Free energy43pirDeltaG 4pirgammavDeltaG free energy difference between the 2 phases will be negativevgammasurface energyfirst term in eqn is negative 2nd is positivetotal Gibbs free energy MatSci Page 1
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