Temperature dependence of the structural order in the {gamma}{prime} phase of nickel base superalloy

Journal Article · Fri Mar 19 04:00:00 EST 1999 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(99)00049-4· OSTI ID:352450

Royer, A ^[1]; Bastie, P ^[2]; Veron, M ^[3]

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1. European Synchrotron Radiation Facility, Grenoble (France)
2. Univ. Joseph Fourier Grenoble 1-CNRS, Saint-Martin-d`Heres (France). Lab. de Spectrometrie Physique
3. LTPCM, Saint-Martin-d`Heres (France)

Single crystal nickel base superalloys are used for the high-temperature parts of aircraft engines like turbine blades. Their good mechanical properties at high temperature are related to the precipitation of an ordered {gamma}{prime} phase which induces a structural hardening of the material. The {gamma}{prime} phase has an ordered L1{sub 2} structure while the {gamma} matrix is disordered and has a FCC structure. The volume fraction of f{gamma}{prime} of the {gamma}{prime} phase evolves with the temperature and a complete solutionizing occurs above 1,280 C in the AM1 superalloy. The {gamma}{prime} phase of Ni based superalloys is usually analyzed through its prototype Ni{sub 3}Al. As the Ni{sub 3}Al structure remains totally ordered up to temperature very close to the melting point, it is commonly assumed in superalloys that the {gamma}{prime} phase precipitates are fully ordered up to their solutionizing and that the volume fraction of the precipitates is equivalent to the volume fraction of the ordered phase. However, in superalloys, it is difficult to separate experimentally the effects related to the solutionizing of the precipitates from those due to a possible partial disordering of the {gamma}{prime} phase and this assumption has not been verified yet. The aim of this paper is to study the structural order in the {gamma}{prime} phase of a superalloy.

• OSTI ID: 352450
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 8 Vol. 40; ISSN 1359-6462; ISSN SCMAF7
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
INTERMETALLIC COMPOUNDS
MICROSTRUCTURE
MONOCRYSTALS
NICKEL BASE ALLOYS
ORDER PARAMETERS
PRECIPITATION
TEMPERATURE DEPENDENCE