Modeling of Phase Separation in Alloys with Coherent Elastic Misfit |
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Authors: | Fratzl Peter Penrose Oliver Lebowitz Joel L |
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Institution: | (1) Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, and University of Leoben, A-8700 Leoben, Austria;(2) Department of Mathematics, Heriot-Watt University, Riccarton, Edinburgh, EH14 4AS, Scotland, U.K;(3) Departments of Mathematics and Physics, Rutgers University, Hill Center, Busch Campus, New Brunswick, 08903, New Jersey |
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Abstract: | Elastic interactions arising from a difference of lattice spacing between two coherent phases can have a strong influence on the phase separation (coarsening) behavior of alloys. If the elastic moduli are different in the two phases, the elastic interactions may accelerate, slow down or even stop the phase separation process. If the material is elastically anisotropic, the precipitates can be shaped like plates or needles instead of spheres and can arrange themselves into highly correlated patterns. Tensions or compressions applied externally to the specimen may have a strong effect on the shapes and arrangement of the precipitates. In this paper, we review the main theoretical approaches that have been used to model these effects and we relate them to experimental observations. The theoretical approaches considered are (i) macroscopic models treating the two phases as elastic media separated by a sharp interface, (ii) mesoscopic models in which the concentration varies continuously across the interface, and (iii) microscopic models which use the positions of individual atoms. |
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Keywords: | kinetics of phase separation quenched alloys elastic interactions sharp interface model diffuse interface models atomic lattice models |
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