On the interplay between tungsten and tantalum atoms in Ni-based superalloys: An atom-probe tomographic and first-principles study

Yaron Amouyal, Zugang Mao, Christopher Booth-Morrison, David N Seidman

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

The partitioning behavior of W in a multicomponent Ni-based superalloy and in a ternary Ni-Al-W alloy is investigated using atom-probe tomography (APT) and first-principles calculations. APT observations indicate that whereas W partitions preferentially to the γ′ (L 12) -precipitates in the ternary alloy, its partitioning behavior is reversed in favor of the γ (fcc) -matrix in the multicomponent alloy. First-principles calculations of the substitutional formation energies of W and Ta predict that Ta has a larger driving force for partitioning to the γ′ phase than W. This implies that Ta displaces W from the γ′ -precipitates into the γ -matrix in multicomponent alloys.

Original languageEnglish (US)
Article number041917
JournalApplied Physics Letters
Volume94
Issue number4
DOIs
StatePublished - Feb 9 2009

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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