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Communication Dans Un Congrès Année : 1995

Three-dimensional investigation of precipitation and interfacial segregation processes on an atomic scale

D Blavette
L Letellier
  • Fonction : Auteur
A Menand
  • Fonction : Auteur

Résumé

The Tomographic Atom-Probe is a new generation of instrument which provides three-dimensional maps of chemical heterogeneities in a metallic material on a subnanometric scale. This technique was applied to the investigation of precipitation and grain-boundary (GB) segregation phenomena in Astroloy nickel base superalloys. 3D images as provided by the tomographic atom-probe reveal the serrated geometry of GB's on a very fine scale and the presence of a strong segregation of both boron and molybdenum at grain-boundaries. Slight carbon enrichment is also detected. Considerable chromium segregation is exhibited at gamma'-gamma' grain-boundaries. Ail these segregants are distributed in a continuous manner along the boundary over a width close to 0.5 nm. Long range order in the gamma'ordered phase is shown to be preserved up to the grain boundary.
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Dates et versions

hal-01928961 , version 1 (20-11-2018)

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  • HAL Id : hal-01928961 , version 1

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D Blavette, L Letellier, A Menand. Three-dimensional investigation of precipitation and interfacial segregation processes on an atomic scale. 4th Japan-France Materials Science Seminar (JFMSS-4) on Structural Evolution in Materials - the Dependence on Atomistic Phenomena, 1995, Unknown, Unknown Region. pp.73--80. ⟨hal-01928961⟩
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