Yield Strength of Nanocrystalline Materials
under High-Rate Plastic Deformation

E. N. Borodin* and A. E. Mayer

Chelyabinsk State University, ul. Brat’ev Kashirinykh 129, Chelyabinsk, 454000 Russia

*e-mail: elbor7@gmail.com

Received July 7, 2011; in final form October 11, 2011

Abstract—A high-rate plastic deformation of fine-grained materials has been considered as a result of compet-
ing processes of dislocation gliding in the grains and grain-boundary sliding. A structural model has been pro-
posed for describing the grain-boundary sliding as a dominant mechanism of plasticity of nanocrystalline met-
als. The dependence of the yield strength on the material properties, temperature, and deformation rate has been
studied numerically. For the adequate description of the experimental data and molecular dynamics calcula-
tions, it is necessary to take into account two parameters, namely, the barrier stress, which is dependent on the
elastic constants of a material, and the boundary viscosity, which is substantially dependent on temperature.

DOI: 10.1134/S1063783412040038

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