Article Dans Une Revue Materials Research Letters Année : 2021

From dislocation nucleation to dislocation multiplication in ceramic nanoparticle

Résumé

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 1 / 2 <110>{110} 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.

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hal-03356913 , version 1 (28-09-2021)

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Inas Issa, Lucile Joly-Pottuz, Jonathan Amodeo, David J Dunstan, Claude Esnouf, et al.. From dislocation nucleation to dislocation multiplication in ceramic nanoparticle. Materials Research Letters, 2021, 9 (6), pp.278-283. ⟨10.1080/21663831.2021.1894253⟩. ⟨hal-03356913⟩
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