Kinetics of Phase Separation in a Binary Alloy: Influence of the Atomic Mobilities
An atomistic kinetic model with a vacancy mediated diffusion mechanism is used to study the precipitation kinetics from a supersaturated solution. We show that, for a given alloy thermodynamics, varying the vacancy-solute binding energy affects the contribution of the coagulation process to coarsening both for low and high solute supersaturation. We also observe that varying the temperature affects the phase separation kinetic pathway in agreement with experimental observations, but at variance with kinetic simulations carried out with the standard direct exchange dynamics.
KeywordsActivation Barrier Solute Atom Direct Exchange Cluster Size Distribution Diffusivity Ratio
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