Abstract
We have used a novel Monte Carlo (MC) scheme for studying diffusional phase transformations. The alloy model takes into account, explicitly, the presence of vacancies and atom transport is through migration of these vacancies. This alloy model, along with a stochastic formulation of vacancy jumps, also leads to a physically meaningful definition of time in the MC simulations. We have used this MC scheme to study precipitation of an $L1_2$ ordered phase from a supersaturated, disordered fcc matrix. Our results show that phase separation and atomic ordering take place simultaneously. This conclusion appears to be valid even for a concentrated alloy, in which atomic ordering is predicted (by a mean field thermodynamic analysis) to occur before phase separation
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