Microstructural design for high-strain-rate superplastic oxide ceramics

Keijiro Hiraga, Byung Nam Kim, Koji Morita, Tohru Suzuki, Yoshio Sakka

Research output: Contribution to journalReview article

20 Citations (Scopus)

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 languageEnglish
Pages (from-to)191-197
Number of pages7
JournalJournal of the Ceramic Society of Japan
Volume113
Issue number1315
DOIs
Publication statusPublished - 2005 Jan 1
Externally publishedYes

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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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