  We consider the disordering dynamics of an interacting binary alloy with a
small admixture of vacancies which mediate atom-atom exchanges. Starting from a
perfectly phase-segregated state, the system is rapidly heated to a temperature
in the disordered phase. A suitable disorder parameter, namely, the number of
broken bonds, is monitored as a function of time. Using Monte Carlo simulations
and a coarse-grained field theory, we show that the late stages of this process
exhibit dynamic scaling, characterized by a set of scaling functions and
exponents. We discuss the universality of these exponents and comment on some
subtleties in the early stages of the disordering process.
