Ordering kinetics in an fcc A_3B binary alloy model: Monte Carlo studies

Details Ordering kinetics in an fcc A_3B binary alloy model: Monte Carlo studies Ordering kinetics in an fcc A_3B binary alloy model: Monte Carlo studies

2002-07-25

arxiv.org/abs/cond-mat/0207611v1

Physics

Condensed Matter

Statistical Mechanics

9 pages, 8 figures, submitted to Phys. Rev. B

Scientific paper

10.1103/PhysRevB.67.134201

Using an atom-vacancy exchange algorithm, we investigate the kinetics of the order-disorder transition in an fcc A_3B binary alloy model following a temperature quench from the disordered phase. We observe two clearly distinct ordering scenarios depending on whether the final temperature T_f falls above or below the ordering spinodal T_{sp}, which is deduced from simulations at equilibrium. For shallow quenches (T_f>T_{sp}) we identify an incubation time tau_{inc} which characterizes the onset of ordering through the formation of overcritical ordered nuclei. The algorithm we use together with experimental information on tracer diffusion in Cu_3Au alloys allows us to estimate the physical time scale connected with tau_{inc} in that material. Deep quenches, T_f

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