Evidence for significant short-range order effects on surface segregation in Ni-Al solid solution

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27 Scopus citations

Abstract

Aluminum surface segregation in Ni-9% Al as studied by low-energy Auger electron spectroscopy is characterized by quite low equilibrium levels that increase with temperature, in contrast to predictions of Bragg-Williams-type theories. The free-energy cumulant expansion approach, adapted for surface segregation, reveals that short-range order can induce significant suppression of solute segregation, depending mainly on the solvent-solute interaction strength. The diminution of the effect with increasing temperature leads to anomalous increase of equilibrium segregation, in agreement with the Ni-Al experiments.

Original languageEnglish
Pages (from-to)1058-1061
Number of pages4
JournalPhysical Review Letters
Volume78
Issue number6
DOIs
StatePublished - 10 Feb 1997

ASJC Scopus subject areas

  • Physics and Astronomy (all)

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