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Unformatted text preview: MatSc 503 Kinetics of Materials Processes Spring 2000 Problem Set #6, Due April 19 1. A given phase transformation, to , occurs by nucleating cuboidal precipitates of from the matrix at 700 K. If the lattices across the / interfaces are continuous, we call the transformation as a coherent transformation; otherwise, it is called an incoherent phase transformation. Although a coherent interface has a lower specific interfacial energy, formation of a coherent particle generates a strain energy which is proportional to the volume of the transformed particle. With the data given below, please determine which nucleation mechanism should dominate at 700 K, coherent or incoherent nucleation. Justify your answer with calculations. Data: enthalpy of transformation H = - 10 10 J m-3 equilibrium transformation temperature, T eq = 1000 K interfacial energy for coherent precipitates, coh = 0.01 J m-2 interfacial energy for incoherent precipitates, incoh = 0.5 J m-2 strain energy per unit volume of coherent precipitate, E = 10...
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This note was uploaded on 01/19/2010 for the course MAT SCI 503 taught by Professor Chen during the Spring '02 term at Pennsylvania State University, University Park.
- Spring '02