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TEM, HRTEM, electron holography and electron tomography studies of γ′ and γ″ nanoparticles in Inconel 718 superalloy
Author(s) -
DUBIEL B.,
KRUK A.,
STEPNIOWSKA E.,
CEMPURA G.,
GEIGER D.,
FORMANEK P.,
HERNANDEZ J.,
MIDGLEY P.,
CZYRSKAFILEMONOWICZ A.
Publication year - 2009
Publication title -
journal of microscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.569
H-Index - 111
eISSN - 1365-2818
pISSN - 0022-2720
DOI - 10.1111/j.1365-2818.2009.03283.x
Subject(s) - high resolution transmission electron microscopy , inconel , electron holography , superalloy , materials science , electron tomography , transmission electron microscopy , electron diffraction , nanoparticle , holography , electron , selected area diffraction , optics , diffraction , nanotechnology , composite material , microstructure , scanning transmission electron microscopy , physics , alloy , quantum mechanics
Summary The aim of the study was the identification of γ′ and γ″ strengthening precipitates in a commercial nickel‐base superalloy Inconel 718 (Ni‐19Fe‐18Cr‐5Nb‐3Mo‐1Ti‐0.5Al‐0.04C, wt %) using TEM dark‐field, HRTEM, electron holography and electron tomography imaging. To identify γ′ and γ″ nanoparticles unambiguously, a systematic analysis of experimental and theoretical diffraction patterns were performed. Using HRTEM method it was possible to analyse small areas of precipitates appearance. Electron holography and electron tomography techniques show new possibilities of visualization of γ′ and γ″ nanoparticles. The analysis by means of different complementary TEM methods showed that γ″ particles exhibit a shape of thin plates, while γ′ phase precipitates are almost spherical.