โ Scribed by W.R. Tyson
No coin nor oath required. For personal study only.
The kinetics of segregation to surfaces in ternary and binary alloys is investigated by computer simulation. It is shown that, in typical alloy systems, segregation occurs much more rapidly than predicted by the McLean equation which applies only in the dilute limit.
R6sum6---L'auteur 6tudie, par simulation sur ordinateur, la cin6tique du ph6nomdne de s6gr6gation vers les surfaces darts les alliages ternaires et binaires. I1 constate que, dans les s~stdmes d'alliage typiques, la s6gr6gation se produit beaucoup plus rapidement que ne le prevoit F6quation de McLean qui ne s'applique qu'h la limite de dilution.
Kinetik der Oberflachensegregation in bin~iren und tern~iren Legierungen wurde in einer Computersimulation untersucht. Es wird gezeigt, dab die Segregation in allen typischen Legierungssystemen viel rascher abl~iuft, als die McLean-Gleichung angibt. Diese Gleichung gilt nur in der Grenze verdiJnnter Systeme.
๐ SIMILAR VOLUMES
A simplified model of impurity induced temper embrittlement is developed assuming that the metal can be represented by a one dimensional chain of atoms where a tight-binding first nearest neighbour basis is used. The grain boundary is represented by a point occupied by an impurity. The model predict
Grain boundary segregation of impurities like P, S, Sb, and others is the origin of temper embrittlement of low-alloy steels. Till now it has been assumed that the segregation is determined by an equilibrium segregation mechanism, but some open questions cannot be satisfactorily explainedby the equi