Journal
SCRIPTA MATERIALIA
Volume 177, Issue -, Pages 54-57Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.scriptamat.2019.09.005
Keywords
Porous material; Transmission electron microscopy; Dislocation; Size effects
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An experimental methodology is developed to evaluate size effects in nanovoids deformation under macroscopic uniaxial stress loading conditions. Quantitative evaluation of voids deformation as a function of voids size shows both a crystallographic effect, albeit small compared to the scatter, and no evidence of size effects for voids diameter larger than 10 nm, while a slight effect is present for smaller voids. Critical assessment of the data in light of theoretical models indicates that these results may be compatible with the presence of a hardened layer at the void/matrix interface, which is illustrated through finite element simulations accounting for surface tension. (C) 2019 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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