scholarly journals Direct observation of dislocation nucleation in pyrite using combined electron channelling contrast imaging and electron backscatter diffraction

Terra Nova ◽  
2018 ◽  
Vol 30 (6) ◽  
pp. 423-430 ◽  
Author(s):  
Anna Rogowitz ◽  
Stefan Zaefferer ◽  
Renelle Dubosq
Keyword(s):  
Direct Observation ◽  
Electron Backscatter Diffraction ◽  
Dislocation Nucleation ◽  
Contrast Imaging ◽  
Electron Channelling ◽  
Electron Backscatter ◽  
Backscatter Diffraction

scholarly journals Novel −75°C SEM cooling stage: application for martensitic transformation in steel

Microscopy ◽  
2020 ◽  
Author(s):  
Kaneaki Tsuzazki ◽  
Motomichi Koyama ◽  
Ryosuke Sasaki ◽  
Keiichiro Nakafuji ◽  
Kazushi Oie ◽  
...  
Keyword(s):  
Martensitic Transformation ◽  
Electron Backscatter Diffraction ◽  
Dislocation Slip ◽  
In Situ Observation ◽  
Contrast Imaging ◽  
Cooling Stage ◽  
Electron Channelling ◽  
Electron Backscatter ◽  
Backscatter Diffraction

Abstract Microstructural changes during the martensitic transformation from face-centred cubic (FCC) to body-centred cubic (BCC) in an Fe-31Ni alloy were observed by scanning electron microscopy (SEM) with a newly developed Peltier stage available at temperatures to  −75°C. Electron channelling contrast imaging (ECCI) was utilized for the in situ observation during cooling. Electron backscatter diffraction analysis at ambient temperature (20°C) after the transformation was performed for the crystallographic characterization. A uniform dislocation slip in the FCC matrix associated with the transformation was detected at −57°C. Gradual growth of a BCC martensite was recognized upon cooling from −57°C to −63°C.

Characterisation of nitride thin films by electron backscatter diffraction and electron channelling contrast imaging

2006 ◽  
Vol 22 (11) ◽  
pp. 1352-1358 ◽  
Author(s):  
C. Trager-Cowan ◽  
F. Sweeney ◽  
A. Winkelmann ◽  
A. J. Wilkinson ◽  
P. W. Trimby ◽  
...  
Keyword(s):  
Thin Films ◽  
Electron Backscatter Diffraction ◽  
Contrast Imaging ◽  
Electron Channelling ◽  
Electron Backscatter ◽  
Backscatter Diffraction

scholarly journals Pop-in behavior and elastic-to-plastic transition of polycrystalline pure iron during sharp nanoindentation

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Fabian Pöhl
Keyword(s):  
Grain Boundaries ◽  
Strong Influence ◽  
Electron Backscatter Diffraction ◽  
Dislocation Nucleation ◽  
Stress Fields ◽  
Shear Stresses ◽  
Statistical Process ◽  
Iron Crystal ◽  
Electron Backscatter ◽  
Backscatter Diffraction

Abstract This study analyzes the elastic-to-plastic transition during nanoindentation of polycrystalline iron. We conduct nanoindentation (Berkovich indenter) experiments and electron backscatter diffraction analysis to investigate the initiation of plasticity by the appearance of the pop-in phenomenon in the loading curves. Numerous load–displacement curves are statistically analyzed to identify the occurrence of pop-ins. A first pop-in can result from plasticity initiation caused by homogeneous dislocation nucleation and requires shear stresses in the range of the theoretical strength of a defect-free iron crystal. The results also show that plasticity initiation in volumes with preexisting dislocations is significantly affected by small amounts of interstitially dissolved atoms (such as carbon) that are segregated into the stress fields of dislocations, impeding their mobility. Another strong influence on the pop-in behavior is grain boundaries, which can lead to large pop-ins at relatively high indentation loads. The pop-in behavior appears to be a statistical process affected by interstitial atoms, dislocation density, grain boundaries, and surface roughness. No effect of the crystallographic orientation on the pop-in behavior can be observed.

The application of electron backscatter diffraction and orientation contrast imaging in the SEM to textural problems in rocks

1999 ◽  
Vol 84 (11-12) ◽  
pp. 1741-1759 ◽  
Author(s):  
David J. Prior ◽  
Alan P. Boyle ◽  
Frank Brenker ◽  
Michael C. Cheadle ◽  
Austin Day ◽  
...  
Keyword(s):  
Electron Backscatter Diffraction ◽  
Contrast Imaging ◽  
Orientation Contrast ◽  
Electron Backscatter ◽  
Backscatter Diffraction
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