A Comparative Study of B2 - DO3 Ordered Iron-Aluminium Alloys Using Atom Probe-Field Ion Microscopy and Transmission Electron Microscopy

1987 ◽  
Vol 78 (8) ◽  
pp. 576-581
Author(s):  
Hans-Jürgen Krause ◽  
James Edward Wittig ◽  
Georg Frommeyer
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Comparative Study ◽  
Aluminium Alloys ◽  
Atom Probe ◽  
Probe Field ◽  
Field Ion Microscopy ◽  
Transmission Electron ◽  
Ion Microscopy

Characterizatiom of spinodally decomposed Fe-30.1% Cr-9.9% Co: Part 2

1986 ◽  
Vol 44 ◽  
pp. 582-583
Author(s):  
S. Spooner ◽  
L. L. Horton ◽  
M. K. Miller
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Atom Probe ◽  
Real Space ◽  
Probe Field ◽  
Α Phase ◽  
Transmission Electron ◽  
Ion Microscopy

Characteristic distances describing the scale of the spinodal microstructure obtained from Transmission Electron Microscopy (TEM), Atom Probe Field Ion Microscopy (APFIM), and Small Angle Neutron Scattering (SANS) are described and compared. These techniques provide a view of the microstructure either directly in real space or indirectly in reciprocal space. The material and its general microstructure are described in Part 1, elsewhere in these proceedings. Only the decomposition of the ferrite phase into a modulated isotropic microstructure consisting of a chromium-enriched α' phase and an iron-rich a phase is considered in this presentation.

scholarly journals A Study of the Phase Decomposition of Fe-Ni-Al-Mo Alloys

1990 ◽  
Vol 186 ◽  
Author(s):  
M.K. Miller ◽  
M.G. Hetherington ◽  
J.R. Weertman ◽  
H.A. Calderon
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Atom Probe ◽  
Lattice Parameter ◽  
Al Alloys ◽  
Phase Decomposition ◽  
Probe Field ◽  
Transmission Electron ◽  
The Matrix ◽  
Ion Microscopy

AbstractThe aging of β′ NiAl precipitates in ferritic Fe-Ni-Al alloys has been studied by transmission electron microscopy (TEM) and atom-probe field-ion microscopy (APFIM). The addition of Mo alters the lattice parameter of the phases and segregation of Mo to the interface between the matrix and the particles may alter the interfacial energy. The compositions of the matrix, precipitates and interfaces have been measured by TEM and APFIM. The results are compared.

scholarly journals Field Ion Microscopy of Tantalum-Carbon Alloys

1970 ◽  
Vol 28 ◽  
pp. 532-533
Author(s):  
P. Rao
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Thin Shell ◽  
Photographic Recording ◽  
General Morphology ◽  
Field Ion Microscopy ◽  
Bright Spots ◽  
Transmission Electron ◽  
Ion Microscopy ◽  
Carbon System

Transmission electron microscopy has proved the existence of interstitial order in the tantalum-carbon system and the structure has been suggested to be tetragonal of composition Ta64C. Detection of interstitial order using field ion microscopy is shown to be possible by observing the general morphology of the interstitial atoms appearing as bright spots at the tip surface. This is necessitated by the fact that photographic recording of stable images from interstitial solid solutions is difficult due to the inherent instability of interstitials present at and in a thin shell of undetermined thickness below the surface. However, interstitial ordering, if present, should be detectable by the appearance of regularly spaced rings of carbon atoms when both species (metal and interstitial) are continuously field evaporating.

scholarly journals FIB Lift-Out and Milling of Cylindrical Specimens for Electron Tomography (or Atom Probe Field Ion Microscopy)

2004 ◽  
Vol 12 (6) ◽  
pp. 34-35
Author(s):  
Lucille A. Giannuzzi
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Electron Beam ◽  
Amorphous Materials ◽  
Electron Tomography ◽  
Atom Probe ◽  
Dark Field ◽  
Specimen Thickness ◽  
Probe Field ◽  
Transmission Electron

Electron tomography using transmission electron microscopy (TEM) and related techniques (e.g., scanning transmission electron microscopy (STEM) or energy filtered TEM (EFTEM)) allow for 3-D microstructural and elemental mapping of specimens, and has been used successfully in the biological sciences where mass-thickness contrast dominates these mostly amorphous materials. Z-contrast STEM imaging via high angle annular dark field (HAADF) tomography has also been used successfully in the physical sciences. STEM, EFTEM, and holography tomography are more useful techniques for crystalline materials, since diffraction contrast in conventional TEM images can hinder image reconstruction. Typical tomography routines utilize conventional electron transparent foils, whereby the dimensions of the specimen perpendicular to the electron beam may be orders of magnitude greater than the specimen thickness parallel to the electron beam. Using this conventional specimen geometry, the effective specimen thickness increases as the specimen is tilted through the ± 70 degrees necessary for the tomographic acquisition process.

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