Atom-probe tomographic study of γ/γ′ interfaces and compositions in an aged Co-Al-W superalloy

Peter J. Bocchini*, Eric A. Lass, Kil Won Moon, Maureen E. Williams, Carelyn E. Campbell, Ursula R. Kattner, David C Dunand, David N Seidman

*Corresponding author for this work

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

Atom-probe tomography (APT) is utilized to investigate, in a Co-9.7Al-10.8W at.% alloy aged at 900 °C for ∼1000 h, the phase compositions and partitioning behavior of the two-phase γ(face-centered cubic)/γ′(L12) microstructure. The APT composition of the γ-matrix (Co-8.97Al-5.69W at.%) agrees well with a previously reported measurement made by energy-dispersive X-ray spectroscopy; however, the composition of the γ′(L12) precipitates (Co-10.03Al-12.48W at.%) is slightly richer in W and Al, and leaner in Co. Partitioning coefficients and Al interfacial excesses are also calculated.

Original languageEnglish (US)
Pages (from-to)563-566
Number of pages4
JournalScripta Materialia
Volume68
Issue number8
DOIs
StatePublished - Apr 1 2013

Keywords

  • Atom-probe tomography
  • Cobalt alloys
  • Interfaces
  • Intermetallic compounds
  • Superalloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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