Scanning Acoustic Microscopy Observations of High-Temperature Crack-Bridging Mechanisms in Alumina

High‐purity, fine‐grained alumina showed a strong R‐curve behavior for long cracks propagated at 1200°C. R‐curve behavior was not observed at room temperature. A combined investigation using high‐frequency scanning acoustic microscopy and scanning electron microscopy of crack profiles demonstrated a...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1993-11, Vol.76 (11), p.2915-2918
Main Authors: Marrow, James, Luprano, Vincenza, Roberts, Steve
Format: Article
Language:English
Subjects:
360203 - Ceramics, Cermets, & Refractories- Mechanical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
CHALCOGENIDES
Chemical industry and chemicals
CRACK PROPAGATION
Exact sciences and technology
FRACTURE PROPERTIES
MATERIALS SCIENCE
MECHANICAL PROPERTIES
Miscellaneous
OXIDES
OXYGEN COMPOUNDS
Technical ceramics
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
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Summary:High‐purity, fine‐grained alumina showed a strong R‐curve behavior for long cracks propagated at 1200°C. R‐curve behavior was not observed at room temperature. A combined investigation using high‐frequency scanning acoustic microscopy and scanning electron microscopy of crack profiles demonstrated asperity contact in the crack wake at 1200°C. A microcrack zone was not observed. Crack bridging, resulting from intergranular subcritical crack propagation was considered to be responsible for the toughness increase with increased crack length.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1993.tb04038.x