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Abstract
A theoretical model is suggested which describes the generation of nanoscale voids (nanovoids) at grain boundaries (GBs) in deformed nanocrystalline and nanocomposite materials. In the framework of the model, nanovoids are generated in the stress fields of the dislocations characterized by large Burgers vectors and formed at GB steps and triple junctions due to intense intergrain sliding. The model accounts for experimental observations of nanovoids at GBs in deformed nanomaterials, reported in the literature.
Acknowledgments
This work was supported, in part, by the Office of US Naval Research (grant N00014-05-1-0217), INTAS (grant 03-51-3779), INTAS-AIRBUS (grant 04-80-7339), Ministry of Education and Science of Russian Federation, Russian Academy of Sciences Program ‘Structural Mechanics of Materials and Construction Elements’, and Russian Science Support Foundation, and Federal Agency of Science and Innovations (grant of the President of the Russian Federation MK-8340.2006.1).