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- Hansson, T.Nagaoka University of Technology (author)
Elevated temperature fracture behavior of monolithic and SiCW- reinforced silicon nitride under quasi-static loads
- Article/chapterEnglish1996
Publisher, publication year, extent ...
- Elsevier BV,1996
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:ltu-12609
- https://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-12609URI
- https://doi.org/10.1016/0921-5093(95)10151-9DOI
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- Language:English
- Summary in:English
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- SwePubSwePub
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Notes
- Godkänd; 1996; 20070507 (cira)
- Fracture behavior of a monolithic and SiCw-reinforced Si3N4 over the 1000-1550 °C temperature range with monotonically increasing loads was investigated. Peaks in the fracture initiation toughness, Kc, were found to occur owing to the brittle-to-ductile transition in the fracture behavior. This transition is associated with the onset of viscous deformation of the secondary intergranular amorphous phase present in the microstructure and the concomitant relaxation of the crack-tip stresses. The brittle-to-ductile transition temperature (BDTT) depends on the loading rate. Damage accumulation in terms of nucleation and growth of cavities ahead of the crack-tip promote stable crack growth at temperatures higher than the BDTT. The length of the subcritical crack increases with increasing temperature. Experiments involving the introduction of stable cracks at elevated temperatures followed by room-temperature fracture toughness testing reveal that shielding owing to the crack-wake bridging increases the apparent fracture resistance above the BDTT. Micromechanisms of the brittle-to-ductile transition and subcritical crack growth at elevated temperatures in the Si3N4 ceramics were discussed.
Subject headings and genre
- TEKNIK OCH TEKNOLOGIER Materialteknik Annan materialteknik hsv//swe
- ENGINEERING AND TECHNOLOGY Materials Engineering Other Materials Engineering hsv//eng
- Materialteknik
- Engineering Materials
Added entries (persons, corporate bodies, meetings, titles ...)
- Ramamurty, U.University of California (author)
- Bull, C.Brown university (author)
- Warren, RichardLuleå tekniska universitet (author)
- Nagaoka University of TechnologyUniversity of California (creator_code:org_t)
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- In:Materials Science & Engineering: Elsevier BV209:1-2, s. 137-1480921-50931873-4936
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