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Author Chen, W. ♦ Wahi, R. P. ♦ Wagner, W. ♦ Petry, W.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword MATERIALS SCIENCE ♦ NIMONIC PE16 ♦ MICROSTRUCTURE ♦ AMBIENT TEMPERATURE ♦ DEFORMATION ♦ FATIGUE ♦ FCC LATTICES ♦ HEAT RESISTING ALLOYS ♦ NEUTRON DIFFRACTION ♦ PRECIPITATION HARDENING ♦ SMALL ANGLE SCATTERING ♦ TRANSMISSION ELECTRON MICROSCOPY ♦ ALLOY-NI43FE33CR16MO3 ♦ ALLOYS ♦ ALUMINIUM ALLOYS ♦ BORON ADDITIONS ♦ BORON ALLOYS ♦ CHROMIUM ALLOYS ♦ COBALT ADDITIONS ♦ COBALT ALLOYS ♦ COHERENT SCATTERING ♦ COPPER ADDITIONS ♦ COPPER ALLOYS ♦ CORROSION RESISTANT ALLOYS ♦ CRYSTAL LATTICES ♦ CRYSTAL STRUCTURE ♦ CUBIC LATTICES ♦ DIFFRACTION ♦ ELECTRON MICROSCOPY ♦ HARDENING ♦ HEAT RESISTANT MATERIALS ♦ IRON ALLOYS ♦ MATERIALS ♦ MECHANICAL PROPERTIES ♦ MICROSCOPY ♦ MOLYBDE ♦ SCATTERING ♦ Metals & Alloys- Structure & Phase Studies
Abstract A nickel-base superalloy Nimonic PE16 shows softening when subjected to low cycle fatigue (LCF) at room temperature. In this work, small-angle neutron scattering (SANS) and transmission electron microscopy (TEM) were used to study the morphology of gamma-prime precipitates in the Nimonic PE16 after LCF at room temperature. In TEM dark-field images using superlattice reflections, deformation bands free of gamma-prime precipitates in the Nimonic PE16 after LCF at room temperature. In TEM dark-field images using superlattice reflections, deformation bands free of gamma-prime precipitates are observed. SANS measurements allowed the characterization of the disappeared precipitates with regard to their average size, size distribution and volume fraction by comparing the scattered intensities of loaded and unloaded specimens. An analysis of the results shows that the gamma-prime precipitates within the deformation bands have completely dissolved and not just disordered or cut to sizes smaller than the TEM resolution limit. 14 refs.
ISSN 09567151
Educational Use Research
Learning Resource Type Article
Publisher Date 1992-05-01
Publisher Place United States
Journal Acta Metallurgica et Materialia
Volume Number 40
Issue Number 5


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