Fabrication of high-strain rate superplastic yttria-doped zirconia polycrystals by adding manganese and aluminum oxides

Conventional superplastic ceramics have been established at temperatures over 1400 °C with a slower deformation velocity of about 10^-4 (s^-1). For the application of superplasticity to the manufacturing process, however, high-strain rate deformation velocity of around 10^-2/s^-1 is necessary. We have reported that alumina addition to 3YTZ (3 mol.%Y₂O₃ doped ZrO₂) is effective in the enhanced ductility. The purpose of this study is to fabricate high-strain rate superplastic 3YTZ by adding manganese and aluminium oxides. Dense and fine-grained 3YTZ systems were obtained by slip casting and low temperature sintering. Manganese and alminium oxides added 3YTZ showed a maximum tensile ductility of about 600% at 1450 °C at a strain rate of 1.2×10^-2 s^-1.