Deformation in ceramics

As previously stated, ceramics are characterized either by the ionic or covalent bonding of their constituents and, consequently, with some exceptions, they exhibit brittle behavior. Also note that the field of ceramics covers a broad range of structures, from completely crystalline to amorphous (mostly glassy structures). Therefore, the main deformation at ambient temperatures is elastic (tending to brittleness) only at elevated temperatures may one speak about plastic deformation, since most ceramics show ductility. Clearly, the temperature level is a 

Pelleg, Mechanical Properties of Ceramics, Solid Mechanics and Its Applications 213, DOI 10.1007/978-3-319-04492-7 4, Springer International Publishing Switzerland 2014 

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T. E. Mitchell, Application of transmission electron microscopy to the study of deformation in ceramic oxides, J. Am. Ceram. Soc., 62 (1979) 254-66. 

It is, therefore, important to bear in mind the CRSS of plastic deformation in ceramics, because several ceramics show not only high-temperature plasticity, but also low-temperature plasticity. 

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