Nonequilibrium state of grain boundaries and spontaneous grain-boundary slippage in bicrystals |
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Authors: | Yu A Khon Yu R Kolobov M B Ivanov A V Butenko |
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Institution: | (1) Institute of Strength Physics and Materials Science, Siberian Branch, Russian Academy of Sciences, Akademicheskiĭ pr. 2/1, Tomsk, 634021, Russia |
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Abstract: | Variables (order parameters) that are related to plastic deformation sites and complement the local densities of grain-boundary defects are separated out in a bicrystal being deformed under creep. By solving an evolutionary equation for the order parameters, it is shown that the nonuniformity and periodicity of spontaneous grain-boundary slippage in bicrystals and an increase in the grain-boundary strain rate under the conditions of boundary-lattice dislocation interaction may be attributed to the occurrence of local nonequilibrium regions (autosolitons). |
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