Constrained grain-boundary sliding and inelasticity of polycrystals |
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Authors: | Sh Kh Khannanov S P Nikanorov |
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Institution: | (1) Institute of Physics of Molecules and Crystals, Ufa Scientific Center, Russian Academy of Sciences, Ufa, 450075 Bashkortostan, Russia;(2) Ioffe Physicotechnical Institute, Russian Academy of Sciences, Politekhnicheskaya ul. 26, St. Petersburg, 194021, Russia |
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Abstract: | A model of inelastic behavior of polycrystals that is based on the idea of constrained grain-boundary sliding is developed.
This model assumes that grain-boundary sliding is accommodated only through grain elastic deformation, which is valid under
low stresses. By way of examples, the dynamic inelastic behavior and a decrease in the elastic moduli of polycrystals subjected
to a small-amplitude ultrasonic field are investigated. It is shown that some of the available experimental data obtained
on ultra-fine-grained materials can be explained in terms of the model. The theory predicts that the decrease in the elastic
moduli is a size effect that is bound to be observed when the grain size is small. These predictions are supported experimentally. |
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