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A theoretical model of plastic deformation of nanocrystalline ceramics in the region
of small grain sizes is proposed. In the framework of the model, deformation is described as
the combined action of grain boundary sliding and emission of lattice dislocations from triple
junctions of grain boundaries. Using the method of discrete dislocation dynamics we obtained
an inverse Hall-Petch relation, which qualitatively coincides with the experimentally
measured dependences of microhardness in nanocrystalline ceramics with extremely small
grain sizes.
Keywords: discrete dislocation dynamics, inverse Hall-Petch relation, ceramics, yield stress, hardness |
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