In Situ Study of Temperature Stability and Precipitation Kinetics of δ and η Phases in Nickel Base Superalloys

In Situ Study of Temperature Stability and Precipitation Kinetics of δ and η Phases in Nickel Base Superalloys

The present study aims at determining the temperature stability and precipitation kinetics of phases like δ -Ni 3 Nb, δ -Ni 3 Ta, η -Ni 3 Ti, and η -Ni 3 (Al,Nb) for potential hardening effect in nickel base superalloys for turbine discs. Two model compositions of nickel base superalloys with differ...

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Veröffentlicht in:Metallurgical and materials transactions. A, Physical metallurgy and materials science Physical metallurgy and materials science, 2022-10, Vol.53 (10), p.3627-3638
Hauptverfasser: Finet, Laurane, Nazé, Loïc, Maurel, Vincent, Esin, Vladimir A.
Format: Artikel
Sprache:eng
Schlagworte:
Aeronautics
Alloys
Aluminum
Characterization and Evaluation of Materials
Chemistry and Materials Science
Composition
Engineering Sciences
Heat
Heat treatment
Kinetics
Materials Science
Metallic Materials
Nanotechnology
Nickel base alloys
Niobium
Original Research Article
Phases
Precipitation
Stability
Structural Materials
Superalloys
Surfaces and Interfaces
Synchrotron radiation
Synchrotrons
Temperature
Thin Films
Turbine disks
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Zusammenfassung:The present study aims at determining the temperature stability and precipitation kinetics of phases like δ -Ni 3 Nb, δ -Ni 3 Ta, η -Ni 3 Ti, and η -Ni 3 (Al,Nb) for potential hardening effect in nickel base superalloys for turbine discs. Two model compositions of nickel base superalloys with different Ti/Al, Nb/Al, and Ta/Al ratios were produced. These alloys were characterized using SEM and TEM. High-energy synchrotron X-ray diffraction (HE-XRD) was used to follow the evolution of phases during various heat treatments. The validity of composition criteria available in the literature as well as that of TCNI7 thermodynamic database to predict the composition and temperature stability of δ and η phases is discussed.
ISSN:1073-5623
1543-1940
DOI:10.1007/s11661-022-06771-6