Monte Carlo Study of Ordering and Domain Growth in a Class of fcc-Alloy Models
Abstract
Ordering processes in fcc-alloys with composition A3B (like Cu3Au, Cu3Pd, CoPt3 etc.) are investigated by Monte Carlo simulation within a class of lattice models based on nearest-neighbor (NN) and second-neighbor (NNN) interactions. Using an atom-vacancy exchange algorithm, we study the growth of ordered domains following a temperature quench below the ordering spinodal. For zero NNN-interactions we observe an anomalously slow growth of the domain size L(t) tα, where α 1/4 within our accessible timescales. With increasing NNN-interactions domain growth becomes faster and α gradually approaches the value 1/2 as predicted by the conventional Lifshitz-Allen-Cahn theory.
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