Nanostructural temporal evolution and solute partitioning in model NI-based superalloys containing ruthenium, rhenium, and tungsten

Dieter Isheim*, Gillian Hsieh, Ronald D. Noebe, David N. Seidman

*Corresponding author for this work

Research output: Contribution to conferencePaperpeer-review

10 Scopus citations

Abstract

Transmission electron microscopy (TEM) and atom-probe tomography (APT) are employed to study the growth and coarsening kinetics of γ'-precipitates and the solute partitioning behavior in a series of model superalloys based on a Ni-8.5Cr-10Al at.% composition with Ru, Ru-Re, or Ru-Re-W additions, during isothermal aging at 800°C up to 256 h. Substituting Ru for Ni is found to retard the growth and coarsening kinetics of the γ'-precipitates; Re and W additions decrease the coarsening rate constant further by an order of magnitude. The exponent of the temporal power law for the precipitate radius is n= (3.3 ± 0.1) and the time exponent for the number density is m = (-0. 82 ± 0.06) for all three alloys, independent of coherency strain energy differences between the three alloys. The aluminum concentration in the γ'-precipitates is found to decrease continuously with aging time, which is consistent with a nucleation and growth precipitation process.

Original languageEnglish (US)
Pages309-314
Number of pages6
StatePublished - Dec 1 2005
EventInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - Phoenix, AZ, United States
Duration: May 29 2005Jun 3 2005

Other

OtherInternational Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005
CountryUnited States
CityPhoenix, AZ
Period5/29/056/3/05

Keywords

  • Atom-probe tomography
  • Coarsening
  • Nickel-based superalloy
  • Rhenium
  • Ruthenium
  • Transmission electron microscopy
  • Tungsten

ASJC Scopus subject areas

  • Engineering(all)

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