Simulation of Precipitation Kinetics with Non-Spherical Particles

A kinetic model that is modified based on Langer and Schwartz theory has been developed to treat precipitation kinetics of non-spherical precipitates. Three types of particle morphology, cuboid, needle and plate, have been treated. Explicitly accounting for coherent elastic strain energy and interfacial energy anisotropy, the model enables the prediction of equilibrium particle morphology. The shape effect on growth kinetics has also been investigated assuming quasi steady-state and shape preserving conditions. Validations against a couple of practical examples have shown reasonable agreements, though care must be taken due to uncertainties from model limitations and discrepancies in experimental data.