Effects of rhenium addition on the temporal evolution of the nanostructure and chemistry of a model Ni-Cr-Al superalloy. II: Analysis of the coarsening behavior

Kevin E. Yoon, Ronald D. Noebe, David N. Seidman*

*Corresponding author for this work

Research output: Contribution to journalArticle

57 Scopus citations

Abstract

The temporal evolution of the nanostructure and chemistry of a model Ni-8.5 at.% Cr-10 at.% Al alloy with the addition of 2 at.% Re was studied using transmission electron microscopy and atom-probe tomography in order to measure the number density and mean radius of the γ′ (L12) precipitates and the chemistry of the γ′-precipitates and the γ (fcc)-matrix. In this article, the coarsening behavior of the γ′-precipitates is discussed in detail and compared with the Umantsev-Olson model for multi-component alloys. In addition, the experimental results are evaluated with PrecipiCalc™ simulations. The results show that the diffusivities of the solute elements play a major role in the coarsening behavior of the γ′-precipitates and that the addition of Re retards the coarsening kinetics and stabilizes the spheroidal morphology of the precipitates by reducing the interfacial energy.

Original languageEnglish (US)
Pages (from-to)1159-1169
Number of pages11
JournalActa Materialia
Volume55
Issue number4
DOIs
StatePublished - Feb 1 2007

Keywords

  • Atom probe tomography
  • Coarsening
  • Nanostructure
  • Nickel alloys
  • Rhenium
  • Umantsev-Olson model

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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