Transformation zone shape effects on crack shielding in ceria-partially-stabilized zirconia (Ce-TZP)-alumina composites

Journal Article · Sun Nov 01 04:00:00 EST 1992 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1992.tb04376.x· OSTI ID:7139649

Yu, C S; Shetty, D K ^[1]; Shaw, M C; Marshall, D B ^[2]

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1. Utah Univ., Salt Lake City, UT (United States). Dept. of Materials Science and Engineering
2. Rockwell International Corp., Thousand Oaks, CA (United States). Science Center

In this paper crack tip shielding is evaluated for observed transformation zones in Ce-TZP/Al[sub 2]O[sub 3] composites, in which the transformation zone sizes were changed significantly by varying the sintering temperature to control the transformation yield stress. The calculated shielding effects are consistent with an observed insensitivity of crack resistance curves to transformation zone size; smaller zones in materials with higher yield stress were associated with larger ratios of wake length to zone width and correspondingly higher normalized shielding stress intensity factors. Shielding due to the dilatational component of the transformation strain accounted for most of the toughening observed in these materials.

• OSTI ID: 7139649
• Journal Information: Journal of the American Ceramic Society; (United States), Journal Name: Journal of the American Ceramic Society; (United States) Vol. 75:11; ISSN 0002-7820; ISSN JACTAW
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
ALLOYS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERIUM ADDITIONS
CERIUM ALLOYS
CHALCOGENIDES
FABRICATION
HARDENING
HEAT TREATMENTS
MATERIALS WORKING
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
RARE EARTH ADDITIONS
RARE EARTH ALLOYS
STRAIN HARDENING
STRESS ANALYSIS
THERMOMECHANICAL TREATMENTS
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES