Effects of tantalum on the partitioning of tungsten between the γ- And γ′-phases in nickel-based superalloys: Linking experimental and computational approaches

Yaron Amouyal, Zugang Mao, David N Seidman*

*Corresponding author for this work

Research output: Contribution to journalArticle

71 Scopus citations

Abstract

Atom probe tomography (APT) and first-principles calculations are implemented to study the partitioning of W to the γ (face-centered cubic)- and γ (L12)-phases in Ni-based alloys. APT observations indicate that whereasW partitions preferentially to the γ-phase in a ternary Ni-Al-W alloy, its partitioning behavior is reversed in favor of the γ-phase in multi-component alloys. Furthermore, the degree of W-partitioning to the γ-phase decreases with the addition of Ta to a Ni-Al-Cr-W alloy, a trend which is consistent with Thermo-Calc simulations. First-principles calculations of the substitutional formation energies of W and Ta at 0 K predict that both elements prefer energetically sharing the Al-sublattice sites of the γ-phase, whereas Ta has a larger tendency to partition to the γ-phase than does W. This implies that Ta displaces W from the γ-phase into the γ-phase in multi-component Ni-based alloys.

Original languageEnglish (US)
Pages (from-to)5898-5911
Number of pages14
JournalActa Materialia
Volume58
Issue number18
DOIs
StatePublished - Jan 1 2010

Keywords

  • Atom probe tomography
  • First-principles calculations
  • Ni-based superalloys
  • Partitioning ratio
  • Tungsten

ASJC Scopus subject areas

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

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