Abstract
The tight-binding Ising model (TBIM) coupled with a mean field approximation formulated as an area-preserving map (APM) is applied to surface segregation of CuNi and very dilute Ag(Ni) alloys. In the former case, it rules out the surface segregation crossover with bulk concentration suggested by some experiments and calculations, by concluding in a Cu-enrichment independent of the concentration and the temperature. In the latter case, it accounts for the spectacular surface sandwich observed experimentally in terms of Ag-segregation at the surface of the Ni-rich precipitated phase, slightly below the temperature of phase separation.
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