From dislocation nucleation to dislocation multiplication in ceramic nanoparticle

Inas Issa, Lucile Joly-Pottuz, Jonathan Amodeo, David J. Dunstan, Claude Esnouf, Julien Réthoré, Vincent Garnier, Jérôme Chevalier, Karine Masenelli-Varlot

Research output: Contribution to journalArticlepeer-review

Abstract

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 (Formula presented.) 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.

Original languageEnglish
Pages (from-to)278-283
Number of pages6
JournalMaterials Research Letters
Volume9
Issue number6
DOIs
Publication statusPublished - 2021
Externally publishedYes

Keywords

  • In situ
  • TEM
  • compression
  • dislocation
  • mgo

ASJC Scopus subject areas

  • Materials Science(all)

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