γ′ phase instabilities in high refractory content γ-γ′ In-base superalloys

Stoichko Antonov, Dieter Isheim, David N. Seidman, Eugene Sun, Randolph C. Helmink, Sammy Tin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

5 Scopus citations

Abstract

Detailed electron microscopy and atom probe tomography (APT) techniques were used to systematically quantify the chemical and morphological instabilities that occur during aging of polycrystalline Ni-base superalloys containing elevated levels of refractory alloying additions. The morphological changes and splitting phenomenon associated with the secondary γ′ precipitates were related to the discrete chemical compositions of the secondary and tertiary γ′ along with the phase compositions of the γ matrix and the γ precipitates that form within the secondary γ′ particles. Compositional phase inhomogeneities led to the precipitation of finely dispersed tertiary γ′ particles within the γ matrix and secondary γ particles within the secondary γ′ precipitates, which, along with surface grooving of the secondary γ′ particles, contributed to the inverse coarsening or splitting of the precipitates during aging.

Original languageEnglish (US)
Title of host publicationSUPERALLOYS 2016 - Proceedings of the 13th International Symposium on Superalloys
EditorsEric Huron, Uwe Glatzel, Cathie Rae, Sammy Tin, Beth Lewis, Venkat Seetharaman, Mark Hardy, Brian Griffin
PublisherMinerals, Metals and Materials Society
Pages199-208
Number of pages10
ISBN (Electronic)9781118996669
StatePublished - 2016
Event13th International Symposium on Superalloys, SUPERALLOYS 2016 - Seven Springs, United States
Duration: Sep 11 2016Sep 15 2016

Publication series

NameProceedings of the International Symposium on Superalloys
Volume2016-January

Other

Other13th International Symposium on Superalloys, SUPERALLOYS 2016
CountryUnited States
CitySeven Springs
Period9/11/169/15/16

Keywords

  • Coarsening
  • Ni-base alloy
  • Phase transformation
  • γ precipitates
  • γ′ instability
  • γ′ splitting

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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