Abstract
Antimony and sulfur segregation on free surfaces of nickel at about 700°C appear to occur via two distinct mechanisms. Antimony segregates more or less uniformly, suggesting a mechanism envolving bulk diffusion. Sulfur, on the other hand, first appears only where grain boundaries intersect the surface and then spreads away from the grain boundaries to cover the entire surface. To our knowledge, this is the first clear evidence for two such distinct mass transport mechanisms operating simultaneously in connection with free surface segregation. Such behavior may be involved in other observations of transient surface segregation where one segregant appears quickly, later to be displaced by another.
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