The theory of grain boundary segregation in terms of surface adsorption analogues View Full Text


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Article Info

DATE

1977-09

AUTHORS

E. D. Hondros, M. P. Seah

ABSTRACT

The theory of equilibrium solute segregation at solid/solid interfaces can be approached usefully from classical surface/gas adsorption isotherms of varying complexity and encompassing both chemisorption and physisorption behavior. Thus, the McLean segregation theory, the simplest type of behavior, is the counterpart of the Langmuir theory for solid/gas adsorption. Assuming strong pair interactions between segregate neighbors, the McLean theory can be adapted to a more complex form, the analogue of the Fowler isotherm, in which adsorbate clustering or protoprecipitation occurs. Again, multilayer segregation is possible, which can be rationalized by " BET " adsorption analogue behavior. Recent developments show how isotherms may be extended to multicomponent systems, assuming interactions between elements and segregants, with important implications in the behavior of embrittlement-prone engineering steels. The mass action equilibrium approach for surface adsorptive reactions is extended here to grain boundaries and tested on the limited number of isotherms available. This may prove to be a useful analytical procedure, giving a rapid insight into the nature of the segregation process, such as adsorbate interactions and variations in adsorption potential among the various sites. More... »

PAGES

1363-1371

Identifiers

URI

http://scigraph.springernature.com/pub.10.1007/bf02642850

DOI

http://dx.doi.org/10.1007/bf02642850

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1019981092


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