Computer simulation of tracer diffusion in a concentrated alloy with long-range order

Abstract

Tracer diffusion via the agency of vacancies in a simple cubic binary alloy with long-range order has been simulated using a Monte Carlo method. Extensive results for the exchange frequencies, vacancy availability factors and tracer correlation factors were collected over the entire composition range at five temperatures. It was found that the ordered region slowed down diffusion from that expected from an extrapolation of the behaviour from the disordered region. The stoichiometric composition signalled the greatest Configurational impediment to diffusion; much of this was provided by the tracer correlation factor.