Abstract
Equilibrium antiphase domain (APB) and interphase (IPB) boundaries in the CuAu system are examined theoretically using the cluster variation method with multiatom interactions whose magnitudes were previously obtained from a fit of the phase diagram. The IPB energy between equilibrium disordered f.c.c. and ordered Cu 3Au phases is strongly temperature (and hence composition) dependent, being much higher for the copper-rich side of the congruent point T c and having a maximum on that side at about 0.95 T c . The IPB energies are only slightly anisotropic. The APB energies at constant chemical potential decrease monotonically with increasing temperature: at constant non-stoichiometric composition they increase at low temperature to a maximum well below the disordering temperature. Near the congruent point, the APB undergoes one or more second-order surface phase transitions in which an interfacial layer resembling the inhomogeneous CuAu ( L1 0) phase develops within the boundary. The APB with ( hk0) orientation (in our notation) should be perfectly wet by the disordered phase at the disordering temperature for that particular composition.
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