High-temperature plastic deformation of fine-grained Y- doped BaCeO 3 polycrystals

The high-temperature plastic deformation of BaCe0.95Y0.05O3- polycrystals with average grain size of 0.50 m has been studied in compression between 1000 and 1250oC in air at different initial strain rates. The stress-strain curves display yield drop at strains close to 5%, followed by steady state or strain-softening stages. Large ductilities were achieved at the higher temperatures, without appreciable changes in grain shape and size. Mechanical data and microstructural observations are consistent with a flow mechanism by grain boundary sliding.