Abstract
Factors limiting the strain rate available to superplastic deformation in oxide ceramics are discussed from existing knowledge about high-temperature plastic deformation and cavitation mechanisms. Simultaneously controlling these factors is essential for attaining high-strain-rate superplasticity (HSRS). This is shown in monolithic tetragonal zirconia and composite materials consisting of zirconia, α-alumina and a spinel phase: at strain rates higher than 10-2 s-1, tensile ductility reached 300-600% in the monolithic material and 600-2500% in the composite materials. Post-deformation microstructure indicates that certain secondary phases should be effective in suppressing cavitation damage and thereby enhancing HSRS.
| Original language | English |
|---|---|
| Pages (from-to) | 191-197 |
| Number of pages | 7 |
| Journal | Journal of the Ceramic Society of Japan |
| Volume | 113 |
| Issue number | 1315 |
| DOIs | |
| Publication status | Published - 2005 Mar |
Keywords
- Accommodation
- Cavity growth
- Cavity nucleation
- Dynamic grain growth
- Grain-boundary sliding
- High-strain-rate superplasticity
- Stress relaxation
ASJC Scopus subject areas
- Ceramics and Composites
- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry
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Cite this
Hiraga, K., Kim, B. N., Morita, K., Suzuki, T. S., & Sakka, Y. (2005). Microstructural design for high-strain-rate superplastic oxide ceramics. Journal of the Ceramic Society of Japan, 113(1315), 191-197. https://doi.org/10.2109/jcersj.113.191