The effect of phosphorus on the formation of grain boundary laves phase in high-refractory content Ni-based superalloys

Stoichko Antonov*, Wei Chen, Song Lu, Dieter Isheim, David N. Seidman, Qiang Feng, Eugene Sun, Sammy Tin

*Corresponding author for this work

Research output: Contribution to journalArticle

7 Scopus citations

Abstract

The effect of phosphorous on the microstructure of a powder-processed, high Nb-content, Ni-based superalloy was studied and compared to a P-free variant. The P-doped sample had a lower incipient melting temperature, forming a (Ni, Co, Cr, P)2(Nb, Mo) laves phase along the grain boundaries. Transmission electron microscopy and atom probe tomography were used to identify the crystal structure, assess phase compositions, and determine any elemental segregation to phase boundaries. The results revealed strong partitioning of P to the laves phase and a slight Mo gradient towards the γ′ phrase. Finally, a simplified laves phase was successfully modeled via density functional theory calculations.

Original languageEnglish (US)
Pages (from-to)44-48
Number of pages5
JournalScripta Materialia
Volume161
DOIs
StatePublished - Mar 1 2019

Keywords

  • Atom probe tomography
  • Density functional theory
  • Laves
  • Phosphorous
  • Superalloy

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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