Publication

Corrélation entre la forme d'inclusions intergranulaires et l'énergie de joints de grains dans un alliage Cu-1Pb

Abstract

Le plomb ajouté dans le cuivre et ses alliages est présent aux joints de grains à l'équilibre capillaire sous la forme de lentilles dont la géométrie est gouvernée par leur angle dièdre. Une méthode de mesure de l'angle dièdre permettant d'accéder à une valeur précise pour chaque inclusion a été développée et appliquée aux inclusions individuelles dans un alliage Cu-1Pb. Les résultats obtenus sur une série d'inclusions montrent une grande dispersion à l'échelle d'un échantillon. Cette observation est interprétée comme une conséquence du fait que, pour une température d'équilibration spécifique, l'angle dièdre sur un joint de grains défini dépend de l'énergie de celui-ci. La dispersion constatée sur les valeurs d'angle dièdre obtenues sur un même échantillon peut dès lors être reliée à la dispersion de l'énergie des joints de grains au sein d'un polycristal, laquelle peut à son tour être reliée à la désorientation relative entre les grains, puisque cette dernière est mesurable par analyse EBSD. Le présent article présente des premiers résultats de cette approche.

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