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Direct Measurement of Impurity Segregation Concentration at Grain Boundaries for Polycrystalline Materials using EBSD and 3D Reconstruction of SEM images of Etch Grooves

Published online by Cambridge University Press:  15 March 2011

Marilyne Cornen
Affiliation:
Polytech'Nantes, Laboratoire Génie des Matériaux et Procédés Associés Rue Christian Pauc, BP 50609, 44306 Nantes Cedex 03, France
René Le Gall
Affiliation:
Polytech'Nantes, Laboratoire Génie des Matériaux et Procédés Associés Rue Christian Pauc, BP 50609, 44306 Nantes Cedex 03, France
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Abstract

Impurity segregation at grain boundaries in polycrystalline alloys is known to have a tremendous impact on the material properties such as mobility, cohesion.. But, direct measurement of grain boundary chemistry is quite complex and there are quite few results concerning polycrystals. In this paper we present an indirect method to measure segregation- misorientation dependence on polycrystalline Ni-S alloys using both EBSD and 3D reconstruction of etch grooves. Samples of Ni-S alloy (7.2 ppm at) have been annealed at different temperatures to get equilibrium segregation at grain boundaries. Then they have been etched near the transpassive potential to form etch grooves, whose geometry depends on the sulfur segregation level. Grain boundaries misorientation statistics and first results about the segregation-misorientation function are given here.

Type
Research Article
Copyright
Copyright © Materials Research Society 2004

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