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The kinetics of ordering in fcc alloys during the growth of a (001) monolayer is investigated by the kinetic mean-field method. The evolution of the structure parameters is calculated. There is a transient ordered state during the growth process and its occurrence depends on the ratio of the atomic exchange rate to the evaporation rate. The growth process displays two stages of evolution. The first stage is the formation of a metastable ordered state whose lifetime increases exponentially with the decrease of the temperature. The second stage is the evolution from the metastable ordered state to the equilibrium ordered state. The stoichiometric concentrations of the metastable ordered state is found to be different from the equilibrium one. The influence of the two characteristic times related to the adsorption and the atomic migration on the kinetics of the growth is analyzed.
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Shi et al. (2002) studied this question.
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