Atomic-scale insight into non-crystallographic slip traces in body-centred cubic crystals

At low and moderate temperatures, dislocation motion propagates plastic flow in crystals through the shearing of dense crystallographic planes by an elementary translation. Almost one century ago, it was discovered that body-centred cubic metals behave differently and slip may occur in ‘non-crystall...

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Bibliographic Details
Published in:Scripta materialia 2019-03, Vol.162, p.292-295
Main Authors: Douat, Benjamin, Coupeau, Christophe, Bonneville, Joël, Drouet, Michel, Vernisse, Loranne, Kubin, Ladislas
Format: Article
Language:English
Subjects:
Acoustics
Automatic
bcc crystals
Biomechanics
Chemical Sciences
Electric power
Electromagnetism
Engineering Sciences
Fluid mechanics
Material chemistry
Materials and structures in mechanics
Mathematical Physics
Mechanics
Niobium crystals
Pencil glide
Physics
Polymers
Quantum Physics
Reactive fluid environment
Scanning tunneling microscopy
Slip traces
Thermics
Vibrations
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Summary:At low and moderate temperatures, dislocation motion propagates plastic flow in crystals through the shearing of dense crystallographic planes by an elementary translation. Almost one century ago, it was discovered that body-centred cubic metals behave differently and slip may occur in ‘non-crystallographic’ planes. Till now slip trace examinations were performed using current imaging and diffraction techniques. A homemade deformation device coupled to a scanning tunneling microscope made it possible to examine (as here shown in niobium crystals) slip traces with atomic resolution. The traces consist of several atomic step combinations, of which the related crystallographic planes were identified. [Display omitted]
ISSN:1359-6462
1872-8456
DOI:10.1016/j.scriptamat.2018.10.032