Temporal evolution of sub-nanometer compositional profiles across the γ/γ' interface in a model Ni-Al-Cr superalloy

Chantal K. Sudbrack*, Ronald D. Noebe, David N. Seidman

*Corresponding author for this work

Research output: Contribution to conferencePaper

6 Scopus citations

Abstract

Early-stage phase separation in a Ni-5.2 Al-14.2 Cr at.% superalloy, isothermally decomposing at 873 K, is investigated with atom-probe tomography. Sub-nanometer scale compositional profiles across the γ/γ'(L1 2) interfaces demonstrate that both the γ-matrix and the γ'-precipitate compositions evolve with time. Observed chemical gradients of Al depletion and Cr enrichment adjacent to the γ'-precipitates are transient, consistent with well-established model predictions for diffusion-limited growth, and mark the first detailed observation of this phenomenon. Furthermore, it is shown that Cr atoms are kinetically trapped in the growing precipitates.

Original languageEnglish (US)
Pages543-548
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

  • Diffusion-limited growth
  • Interface composition
  • Nanostructure
  • Nickel alloys

ASJC Scopus subject areas

  • Engineering(all)

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    Sudbrack, C. K., Noebe, R. D., & Seidman, D. N. (2005). Temporal evolution of sub-nanometer compositional profiles across the γ/γ' interface in a model Ni-Al-Cr superalloy. 543-548. Paper presented at International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005, Phoenix, AZ, United States.