From dislocation nucleation to dislocation multiplication in ceramic nanoparticle

Magnesium oxide nanocubes are compressed along the [001] direction in situ in the transmission electron microscope. Incipient plasticity in the smaller samples is characterized by the nucleation of few dislocations while a larger number of line defects is observed in larger nanocubes. Yield and flow...

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Bibliographic Details
Published inMaterials Research Letters Vol. 9; no. 6; pp. 278 - 283
Main Authors Issa, Inas, Joly-Pottuz, Lucile, Amodeo, Jonathan, Dunstan, David J., Esnouf, Claude, Réthoré, Julien, Garnier, Vincent, Chevalier, Jérôme, Masenelli-Varlot, Karine
Format Report
LanguageEnglish
Published Taylor & Francis 03.06.2021
Subjects
compression
dislocation
In situ
mgo
TEM
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Summary:Magnesium oxide nanocubes are compressed along the [001] direction in situ in the transmission electron microscope. Incipient plasticity in the smaller samples is characterized by the nucleation of few dislocations while a larger number of line defects is observed in larger nanocubes. Yield and flow stresses scattered stochastically above a minimum value varying as the inverse of the sample size. The upper bound is given by the reduced number of dislocation sources. Such size-dependent behaviour is justified by a detailed statistical analysis and is fully explained by the deformation mechanism.
ISSN:2166-3831
DOI:10.1080/21663831.2021.1894253