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- W2024338214 abstract "This paper considers the sources of variability in segregation to random high angle grain boundaries. The variation in segregation to most grain boundaries is within ±30% of an average value. However, the composition of some boundaries is even farther away from the average. Although deviation in fracture path, bulk chemical inhomogeneities, and a lack of equilibrium can contribute to the variation, analysis of the data clearly shows that differences in grain boundary structure must play a role. The cause of the relationship between structure and segregation is discussed in terms of chemical bonds that are formed between the segregant and the metal atoms comprising the boundary. Finally, it is shown that variation in segregation in a single boundary is not as great as the variation among grain boundaries. Dans cet article, nous étudions les causes de variation de la ségrégation dans les joints de grains de forte desorientation. La variation de la ségrégation sur la plupart des joints de grains se limits à ±30% d'une valeur moyenne; cependant la composition de quelques joints s'écarte plus de cette moyenne. Bien qu'une déviation du chemin de rupture, des hétérogénéités chimiques massives et un manque d'équilibre puissent contribuer à cette variation, l'analyse des données montre clairement que les différences dans la structure des joints de grains doivent jouer un rôle. Nous discutons la cause de la relation entre structure et ségrégation a partir des liaisons chimiques formées entre l'élément qui ségrège et les atomes métalliques du joint. Enfin, nous montrons que la variation de ségrégation sur un joint unique n'est pas aussi grande que celle qu'on observe sur plusieurs joints de grains. In dieser Arbeit werden die Ursachen der Unterschiede in der Segregation an. regellosen Groβwinkelkorngrenzen betrachtet Die Schwankungen in der Segregation liegen bei den meisten Korngrenzen innerhalb von ±30% um einen mittleren Wert. Allerdings weicht die Zusammensetzung einiger Korngrenzen weit stärker ab. Abweichungen vom Bruchverhalten, chemische Inhomogenitäten im Volumen und ein fehlendes Gleichgewicht können zu der starken Schwankung beitragen. Jedoch geht aus der Analyse der Ergebnisse eindeutig hervor, daβ Unterschiede in der Korngrenzstruktur eine Rolle spielen. Die Ursache für den Zusammenhang zwischen Struktur und Segregation wird anhand der chemischen Bindungen diskutiert, die sich zwischen den segregierten Atomen und den Metallatomen in der Korngrenze ausbilden. Schlieβlich wird gezeigt, daβ Unterschiede in der Segregation an eine einzelne Korngrenze nicht so groβ sind wie die Unterschiede zwischen Korngrenzen." @default.
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- W2024338214 date "1983-02-01" @default.
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- W2024338214 title "Sources of variability in grain boundary segregation" @default.
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- W2024338214 doi "https://doi.org/10.1016/0001-6160(83)90102-5" @default.
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