Analysis of the mechanism of plasticity and destruction using metal oxides

Possible mechanisms of plasticity and fracture of nanoceramic materials based on ZrO ₂ and Y ₂ O ₃ and their mixtures are considered. It was found that the most probable source of plastic strain transfer in nanocrystalline ceramics are macrodislocations - linear defects of the translational symmetry of the macrolattice, the nodes of which are nanograins. For a continuous description of the mechanical properties of macrolattices, it is correct to use the models of the theory of dislocations and fracture. In particular, on this basis it is possible to describe the mechanisms of plastic deformation and fracture of nanoceramic materials. The most probable reasons for the low plasticity margin of nanoceramics are the high inhomogeneity of the nanostructure and significant pore sizes after sintering. The most probable mechanism of destruction is the growth of large pores, induced by the emergence of a significant number of macrodislocations on their surface. Il. 3, bibliography: 36 titles.