Titel
Direct observation of dislocation nucleation in pyrite using combined electron channelling contrast imaging and electron backscatter diffraction
Autor*in
Stefan Zaefferer
Max Planck Institute for Iron Research
Autor*in
Renelle Dubosq
Department of Earth & Environmental Sciences, University of Ottawa
Abstract
Crystal‐plastic deformation is one of the main mechanisms that can accommodate large amounts of strain within the lithosphere. Despite the requirement of understanding dislocation nucleation and arrangement, the only accepted method for direct observation of dislocations in geological materials so far is transmission electron microscopy. Herein, we present a study using a combination of electron channelling contrast imaging (ECCI) and electron backscatter diffraction (EBSD) to visualize and analyse crystal defects in pyrite deforming close to the crystal plastic to brittle transition zone. Structures in focus include (a) dislocation nucleation at crack‐tips and (b) the reactivation of mode I cracks accompanied by the nucleation of dislocations and crystal‐plastic behaviour resulting in the development of complex dislocation structures and low‐angle grain boundaries. EBSD maps reveal an increase in misorientation towards micro‐cracks, consistent with a greater dislocation density along cracks observed by ECCI.
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
https://phaidra.univie.ac.at/o:996626
Erschienen in
Titel
Terra Nova
Band
30
Ausgabe
6
Seitenanfang
423
Seitenende
430
Verlag
Wiley
Erscheinungsdatum
2018
Zugänglichkeit
Rechteangabe
© 2018 The Authors

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