The effect of Nb on grain boundary segregation of B in high refractory Ni-based superalloys

Stoichko Antonov*, Jiajie Huo, Qiang Feng, Dieter Isheim, David N Seidman, Randolph C. Helmink, Eugene Sun, Sammy Tin

*Corresponding author for this work

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Atom probe tomography was used to quantitatively assess grain boundary phase compositions and determine local segregation along the grain boundary before and after a 1000 h thermal exposure at 800 °C on an experimental powder processed Ni-base superalloy containing elevated levels of Nb. Due to high levels of refractory alloying elements at the grain boundary, a complex network of σ phase precipitates formed and the interfacial segregation profiles were studied. Although elemental B segregates to grain boundaries and secondary phase interfaces, insufficient levels are present to result in boride formation due to an enhanced solubility of B in the matrix phase.

Original languageEnglish (US)
Pages (from-to)35-38
Number of pages4
JournalScripta Materialia
Volume138
DOIs
StatePublished - Sep 1 2017

Keywords

  • Atom probe tomography
  • Grain boundaries
  • Precipitation
  • Superalloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

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