Gamma Prime Precipitate Evolution During Aging of a Model Nickel-Based Superalloy

A. J. Goodfellow, E. I. Galindo-Nava, K. A. Christofidou, N. G. Jones, T. Martin, P. A.J. Bagot, C. D. Boyer, M. C. Hardy, H. J. Stone*

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

32 Citations (Scopus)
261 Downloads (Pure)

Abstract

The microstructural stability of nickel-based superalloys is critical for maintaining alloy performance during service in gas turbine engines. In this study, the precipitate evolution in a model polycrystalline Ni-based superalloy during aging to 1000 hours has been studied via transmission electron microscopy, atom probe tomography, and neutron diffraction. Variations in phase composition and precipitate morphology, size, and volume fraction were observed during aging, while the constrained lattice misfit remained constant at approximately zero. The experimental composition of the γ matrix phase was consistent with thermodynamic equilibrium predictions, while significant differences were identified between the experimental and predicted results from the γ′ phase. These results have implications for the evolution of mechanical properties in service and their prediction using modeling methods.

Original languageEnglish
Pages (from-to)1-11
Number of pages11
JournalMetallurgical and Materials Transactions A
Early online date10 Oct 2017
DOIs
Publication statusPublished - 1 Mar 2018

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