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 language | English |
|---|---|
| Pages (from-to) | 1058-1061 |
| Number of pages | 4 |
| Journal | Physical Review Letters |
| Volume | 78 |
| Issue number | 6 |
| DOIs | |
| State | Published - 10 Feb 1997 |
ASJC Scopus subject areas
- General Physics and Astronomy