  A continuum model derived from an atomistic Hamiltonian is used to examine
the ordering kinetics in CuAu. A detailed description of the formation of the
low and high temperature ordered and modulated superlattice states is given.
The metastability of the modulated phase at low temperatures is shown to
severely hinder creation of the ordered superlattice. Formation of the
modulated superlattice is shown to results in interesting lamellar and
labyrinthine structures.
