Assessing size effects on the deformation of nanovoids in metallic materials

SCRIPTA MATERIALIA

卷:177

Article

Hure, J.¹  Barrioz, P. O.¹  Tanguy, B.¹ 

[1] Univ Paris Saclay, CEA, DEN Serv Etud Mat Irradies, F-91191 Gif Sur Yvette, France

关键词: Porous material;    Transmission electron microscopy;    Dislocation;    Size effects;   

DOI  :  10.1016/j.scriptamat.2019.09.005

来源: Elsevier

【 摘 要 】

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.

【 授权许可】

Free