Analysis of the mechanisms of plasticity and failure of metal oxide based nanoceramic materials (Review)

作者：Vasil'ev L S^*; Karban O V

来源：Glass and Ceramics, 2007, 64(5-6): 193-200.

DOI：10.1007/s10717-007-0050-3

Possible mechanisms of the plasticity and failure of nanoceramic materials based on ZrO2 and Y2O3 and their mixtures are examined. It is established that macrodislocations-linear defects in the translational symmetry of a macrolattice whose sites are nanograins - are the most likely source of plastic deformation transfer in a nanocrystalline ceramics. In a continuum description of the mechanical properties of macrolattices it is correct to use models from the theory of dislocations and failure. Specifically, on this basis it is possible to describe mechanisms of plastic deformation and failure of nonceramic materials. The most likely reasons for the small excess plasticity of a nanoceramic are the high nonuniformity of the nanostructure and the substantial sizes of the pores after sintering. The most likely mechanism of failure is an increase in the size of the large pores, which is due to the emergence of a substantial number of macrodislocations on their surface.

• 出版日期2007-5