Role of autocatalytic transformation in zone shape and toughening of ceria-tetragonal-zirconia-alumina (Ce-TZP/Al sub 2 O sub 3 ) composites

Journal Article · Fri Mar 01 04:00:00 EST 1991 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1991.tb04082.x· OSTI ID:5156186

Tsai, J F; Yu, C S; Shetty, D K ^[1]

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1. Dept. of Materials Science and Engineering, Univ. of Utah, Salt Lake City, UT (US)

Stress-strain behaviors in three-point bending, transformation zones in single-edge-notch-bend specimens, and transformation toughening were studied in two types of Ce-TZP/Al{sub 2}O{sub 3} composites. A commercial grade exhibited yield-point behavior triggered by autocatalytic transformation and elongated zones. A new grade of Ce-TZP/Al{sub 2}O{sub 3} composite showed monotonic stress-strain behavior and a zone shape close to theoretical prediction based on a shear-dilation yield criterion. The effects of zone sizes and shapes on fracture toughness of the two ceramic composites are shown to be qualitatively consistent with the predictions of transformation-zone shielding theories.

• OSTI ID: 5156186
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 74:3; ISSN 0002-7820; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603 -- Materials-- Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CATALYSIS
CERAMICS
CERIUM COMPOUNDS
CERIUM OXIDES
CHALCOGENIDES
COMPOSITE MATERIALS
FRACTURE PROPERTIES
MATERIALS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
RARE EARTH COMPOUNDS
SHIELDING
STRAINS
STRESSES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES
ZONES