Atom probe analysis of the compositions of. gamma. prime and. gamma. double prime intermetallic phases in nickel-based superalloy 718

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:7009850

Miller, M K ^[1]; Burke, M G ^[2]

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1. Oak Ridge National Lab., TN (USA)
2. Westinghouse Electric Corp., Pittsburgh, PA (USA). Science and Technology Center

An atom probe field ion microscopy and transmission electron microscopy characterization has been performed on the intragranular precipitates that are formed in a niobium-modified nickel-base superalloy 718 after the various stages of a multistage heat treatment. Atom probe results indicate that there is a wide variation in the compositions of the DO{sub 22}-ordered {gamma}{double prime}, the Ll{sub 2}-ordered {gamma}{prime} precipitates and the {gamma} matrix with heat treatment and with position in the microstructure. 7 refs., 4 figs., 7 tabs.

• Research Organization: Oak Ridge National Lab., TN (USA)
• Sponsoring Organization: DOE/ER
• DOE Contract Number: AC05-84OR21400
• OSTI ID: 7009850
• Report Number(s): CONF-900466-6; ON: DE90009858
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
ALLOY-NI53CR19FE19NB5MO3
ALLOYS
ALUMINIUM ADDITIONS
ALUMINIUM ALLOYS
CARBIDES
CARBON COMPOUNDS
CHEMICAL COMPOSITION
CHROMIUM ALLOYS
CORROSION RESISTANT ALLOYS
CRYSTAL STRUCTURE
ELECTRON MICROSCOPY
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HEAT TREATMENTS
INCONEL 718
INCONEL ALLOYS
INTERMETALLIC COMPOUNDS
ION MICROSCOPY
IRON ALLOYS
LAVES PHASES
MATERIALS
MICROSCOPY
MICROSTRUCTURE
MOLYBDENUM ALLOYS
NICKEL ALLOYS
NICKEL BASE ALLOYS
NIOBIUM A
NIOBIUM CARBIDES
NIOBIUM COMPOUNDS
PHASE STUDIES
PRECIPITATION
REFRACTORY METAL COMPOUNDS
SEPARATION PROCESSES
TRANSITION ELEMENT COMPOUNDS
TRANSMISSION ELECTRON MICROSCOPY