27-782 Phase Transformations in Solids I

12 units, Carnegie Mellon University

Special topics in applied thermodynamics, with particular emphasis on free energycomposition diagrams and their applications, are developed in some detail. The kinetic equations of both classical and nonclassical nucleation theory are then derived. Special emphasis is placed upon the influence of the critical nucleus shape, and the nucleation site, upon nucleation kinetics. The limited experimental evidence available for testing nucleation theory is critically examined. The principal relationships for diffusional growth are next deduced. The structure of interphase boundaries is considered both theoretically and experimentally and its influence upon growth kinetics is demonstrated through comparisons of calculated and measured growth kinetics in model alloy systems. 4 hrs. lec.

Prerequisites: none listed

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