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Phase Transformation and Segregation to Lattice Defects in Ni-Base Superalloys

Published online by Cambridge University Press:  14 November 2007

Didier Blavette ,
Emmanuel Cadel ,
Cristelle Pareige ,
Bernard Deconihout  and
Pierre Caron
Didier Blavette
Affiliation:
Groupe de Physique des Matériaux, UFR Sciences, site du Madrillet, Avenue de l'Université BP12 76801 St Etienne du Rouvray Cedex, France ONERA/DMMP, 29 avenue de la Division Leclerc, BP72 92322 Châtillon Cedex, France
Emmanuel Cadel
Affiliation:
Groupe de Physique des Matériaux, UFR Sciences, site du Madrillet, Avenue de l'Université BP12 76801 St Etienne du Rouvray Cedex, France
Cristelle Pareige
Affiliation:
Groupe de Physique des Matériaux, UFR Sciences, site du Madrillet, Avenue de l'Université BP12 76801 St Etienne du Rouvray Cedex, France
Bernard Deconihout
Affiliation:
Groupe de Physique des Matériaux, UFR Sciences, site du Madrillet, Avenue de l'Université BP12 76801 St Etienne du Rouvray Cedex, France
Pierre Caron
Affiliation:
Groupe de Physique des Matériaux, UFR Sciences, site du Madrillet, Avenue de l'Université BP12 76801 St Etienne du Rouvray Cedex, France
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Abstract

Nanostructural features of nickel-base superalloys as revealed by atom probe field ion microscopy (APFIM) and atom probe tomography (APT) are reviewed. The more salient information provided by these techniques is discussed through an almost exhaustive analysis of literature over the last 30 years. Atom probe techniques are shown to be able to measure the composition of tiny γ′ precipitates, a few nanometers in size, and to reveal chemical order within these precipitates. Phase separation kinetics in model NiCrAl alloys was investigated with both 3DAP and Monte-Carlo simulation. Results are shown to be in good agreement. Plane by plane analysis of {001} planes of Ni3Al-type γ′ phase makes it possible to estimate the degree of order as well as the preferential sites of various addition elements (Ti, Cr, Co, W, Ta, Re, Ru, etc.) included in superalloys. Clustering effects of Re in the γ solid solution were also exhibited. Due to its ultrahigh depth resolution, the microchemistry of interfaces and grain boundaries can be characterized on an atomic scale. Grain boundaries in Astroloy or N18 superalloys were found to be enriched in B, Mo, and Cr and Al depleted.

Keywords

atom probenickelsuperalloyprecipitation
Type
Research Article
Information
Microscopy and Microanalysis , Volume 13 , Issue 6: Special Issue: Atom Probe Tomography , December 2007 , pp. 464 - 483
Copyright
© 2007 Microscopy Society of America

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References

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Figure 16. Intergranular Segregation of Boron in Nickel base Superalloy

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