High-strain-rate superplasticity in oxide ceramics

Keijiro Hiraga*, Byung Nam Kim, Koji Morita, Hidehiro Yoshida, Tohru S. Suzuki, Yoshio Sakka

*この研究の対応する著者

研究成果: Review article査読

31 被引用数 (Scopus)

抄録

Factors limiting the strain rate of superplastic deformation in ceramic materials are discussed on the basis of existing models and experimental results concerning high-temperature plastic deformation, intergranular cavitation and dynamic grain growth. From the discussion, it is indicated that simultaneously fulfilling the following conditions is essential for attaining high-strain-rate superplasticity (HSRS) in ceramic materials: reduction in the initial grain size, enhanced diffusivity, suppressed dynamic grain growth, a homogeneous microstructure and a reduced number of residual defects. In the light of these conditions, explanations are given for HSRS attained in earlier studies on some oxide materials. It is also shown that HSRS can be intentionally attained in doped yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) and composites synthesized from ZrO2, Al2O3 and MgO2; the tensile ductility of these composites reached 300-2500% at a strain rate of 0.01-1.0 s-1. The postdeformation microstructure indicates that some secondary phases may suppress cavitation damage and thereby enhance HSRS.

本文言語English
ページ(範囲)578-587
ページ数10
ジャーナルScience and Technology of Advanced Materials
8
7-8
DOI
出版ステータスPublished - 2007 10
外部発表はい

ASJC Scopus subject areas

  • 材料科学(全般)

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