Effects of a tantalum addition on the morphological and compositional evolution of a model Ni-Al-Cr superalloy

Christopher Booth-Morrison*, Ronald D. Noebe, David N. Seidman

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

8 Scopus citations

Abstract

The effects of a 2.0 at.% addition of Ta to a model Ni-Al-Cr superalloy aged at 1073 K are assessed using scanning electron microscopy and atom-probe tomography. The addition of Ta results in appreciable strengthening, and the morphology is found to evolve from a bimodal distribution of spheroidal precipitates, to cuboidal precipitates aligned along the elastically soft 〈001〉-type directions. Tantalum is observed to partition preferentially to the γ′-precipitate phase and decreases the mobility of Ni in the γ-matrix sufficiently to cause an accumulation of Ni on the γ-matrix side of the γ′-precipitate/γ-matrix heterophase interface.

Original languageEnglish (US)
Pages73-79
Number of pages7
DOIs
StatePublished - 2008
Event11th International Symposium on Superalloys, Superalloys 2008 - Champion, PA, United States
Duration: Sep 14 2008Sep 18 2008

Other

Other11th International Symposium on Superalloys, Superalloys 2008
CountryUnited States
CityChampion, PA
Period9/14/089/18/08

Keywords

  • Atom-probe tomography
  • Nanostructures
  • Nickel-based superalloys
  • Tantalum

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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