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 conferencePaper

7 Citations (Scopus)

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
StatePublished - Dec 1 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

Fingerprint

Tantalum
heat resistant alloys
tantalum
Superalloys
Precipitates
precipitates
matrices
Tomography
partitions
tomography
Atoms
Scanning electron microscopy
scanning electron microscopy
probes
causes
atoms

Keywords

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

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Booth-Morrison, C., Noebe, R. D., & Seidman, D. N. (2008). Effects of a tantalum addition on the morphological and compositional evolution of a model Ni-Al-Cr superalloy. 73-79. Paper presented at 11th International Symposium on Superalloys, Superalloys 2008, Champion, PA, United States.
Booth-Morrison, Christopher ; Noebe, Ronald D. ; Seidman, David N. / Effects of a tantalum addition on the morphological and compositional evolution of a model Ni-Al-Cr superalloy. Paper presented at 11th International Symposium on Superalloys, Superalloys 2008, Champion, PA, United States.7 p.
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Booth-Morrison, C, Noebe, RD & Seidman, DN 2008, 'Effects of a tantalum addition on the morphological and compositional evolution of a model Ni-Al-Cr superalloy' Paper presented at 11th International Symposium on Superalloys, Superalloys 2008, Champion, PA, United States, 9/14/08 - 9/18/08, pp. 73-79.

Effects of a tantalum addition on the morphological and compositional evolution of a model Ni-Al-Cr superalloy. / Booth-Morrison, Christopher; Noebe, Ronald D.; Seidman, David N.

2008. 73-79 Paper presented at 11th International Symposium on Superalloys, Superalloys 2008, Champion, PA, United States.

Research output: Contribution to conferencePaper

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T1 - Effects of a tantalum addition on the morphological and compositional evolution of a model Ni-Al-Cr superalloy

AU - Booth-Morrison, Christopher

AU - Noebe, Ronald D.

AU - Seidman, David N

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N2 - 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.

AB - 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.

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KW - Nanostructures

KW - Nickel-based superalloys

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Booth-Morrison C, Noebe RD, Seidman DN. Effects of a tantalum addition on the morphological and compositional evolution of a model Ni-Al-Cr superalloy. 2008. Paper presented at 11th International Symposium on Superalloys, Superalloys 2008, Champion, PA, United States.