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Abstract
A theoretical model is suggested which describes the generation of lattice perfect, lattice partial and grain boundary dislocation loops (DLs) at pre-existent DLs in mechanically loaded nanocrystalline materials (NCMs). The energy characteristics of various modes of the DL generation are calculated and compared. With these calculations and comparison, the two basic ranges of the grain size in NCMs are revealed each is characterized by its specific set of effectively operating modes of the DL generation and plastic deformation. The role of the DL generation in plastic and superplastic deformation processes in NCMs is discussed.
Acknowledgements
This work was supported, in part, by the Office of US Naval Research (grants N00014-01-1-1020 and N00014-05-1-0217), INTAS (grant 03-51-3779), Russian Science Support Foundation, Russian Fund of Basic Research (grant 04-01-00211), The Programs of the Ministry of Education and Science of Russian Federation on Solid Nanostructures and Development of Science Potential of High School, Russian Academy of Sciences Program “Structural Mechanics of Materials and Construction Elements”, and St. Petersburg Scientific Center.