The discovery of superplasticity in ceramics polycrystals led to debates about whether or not earlier models developed for metallic polycrystals could apply to these systems. In particular, all existing models require some mobility of lattice or grain-boundary dislocations whereas such activity was not observed in most ceramic systems. A model was presented that accounts for the occurrence of superplasticity in the absence of dislocation motion. It was based on a mechanism of grain-boundary sliding by pure-shear motion under stationary conditions, which was accommodated by lattice or grain-boundary diffusion. The prediction of this model regarding the temperature dependences of the stress exponent and of the effective activation energy were found in agreement with experimental results and literature data on five ceramic systems where dislocation activity could not be recorded: β-SiAlON polycrystals, Al-doped SiC polycrystals, nanocrystalline MgO, yttria-tetragonal zirconia polycrystals, and alumina ceramics polycrystals.

Diffusion-Driven Superplasticity in Ceramics: Modeling and Comparison with Available Data. D.Gómez-García, E.Zapata-Solvas, A.Domínguez-Rodríguez, L.P.Kubin: Physical Review B, 2009, 80[21], 214107