Nanoscale studies of the chemistry of a René N6 superalloy

Kevin E. Yoon, Dieter Isheim, Ronald D. Noebe, David N. Seidman*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

48 Scopus citations

Abstract

Atom-probe field-ion microscopy (APFIM) is used to study partitioning of the alloying elements between the γ (FCC) and γ′ (L12) phases and their segregation behavior at γ/γ′ interfaces of a René N6 nickel-based superalloy. The atomic-scale resolution and real space reconstruction capability for elemental chemical mapping makes three-dimensional atom-probe microscopy especially suitable for subnanoscale investigations of complex multicomponent superalloys. Concentration profiles of this alloy, obtained from an atom probe analysis, reveal the partitioning behavior of the alloying elements in René N6. As anticipated, the matrix strengtheners, such as Mo and W, are partitioned to the γ (FCC) matrix, while Re segregates at the γ/γ′ interfaces; the Gibbsian interfacial excess of Re is determined by both one-dimensional (2.32 atoms nm-2) and three-dimensional atom-probe microscopies (3.92 atoms nm-2) and the values obtained are in reasonable agreement.

Original languageEnglish (US)
Pages (from-to)249-255
Number of pages7
JournalInterface Science
Volume9
Issue number3-4
DOIs
StatePublished - Nov 2001

Keywords

  • Gibbsian interfacial excesses
  • Nickel-based superalloy
  • Rhenium
  • Three-dimensional atom-probe microscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Materials Science(all)
  • Condensed Matter Physics

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