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

Published version
Peer-reviewed

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Authors

Goodfellow, AJ 
Galindo-Nava, E 
Christofidou, K 
Jones, NG 
Martin, T 

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, whilst the constrained lattice misfit remained constant at approximately zero. The experimental composition of the γ matrix phase was consistent with thermodynamic equilibrium predictions, whilst significant differences were identified between the experimental and predicted results from the γʹ phase. These results have implications for the evolution of mechanical properties in service and their prediction using modeling methods.

Description

Keywords

40 Engineering, 4016 Materials Engineering, Aging

Journal Title

Metallurgical and Materials Transactions A

Conference Name

Journal ISSN

1073-5623
1543-1940

Volume Title

49

Publisher

Springer
Sponsorship
Engineering and Physical Sciences Research Council (EP/H022309/1)
Engineering and Physical Sciences Research Council (EP/M005607/1)
EPSRC (1504226)
The authors wish to acknowledge Mrs. S. Rhodes, Dr. H.T. Pang, Dr. D.M. Collins, and Dr. O.M.D.M. Messé for their assistance with the experiments performed. Funding was provided by the EPSRC/Rolls-Royce Strategic Partnership under EP/M005607/1 and EP/H022309/1. The Oxford Atom Probe facility was funded by the EPSRC under EP/M022803/1. Neutron diffraction beam time was supported through the Canadian Neutron Beam Centre under Experiment number 1258.