Abstract
Based on a numerical version of the Fourier transformation approach to the nonlinear Cahn-Hilliard diffusion equation, computer simulations of the dynamics of spinodal decomposition for a model alloy are carried out. The present simulations start from fluctuations in composition with small amplitudes and wavelengths (a few lattice spacings). This version predicts that the Cahn-Hilliard equation has only weak nonlinear character. The evolution of the composition profile and the dynamical wave-number selection of the modulated structure are studied. The wavelength modulation of the composition profile occurs strongly in the early stage and becomes much weaker in the later stage
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