High temperature failure of ceramics

Journal Article · Mon Sep 01 00:00:00 EDT 1986 · J. Mater. Energy Syst.; (United States)

DOI:https://doi.org/10.1007/BF02833345· OSTI ID:7046038

Dalgleish, B J; Slamovich, E; Evans, A G

Microstructural heterogeneities are observed to have a dual influence on the creep rupture behaviour of a polycrystalline alumina. The duality is related to a transition in rupture mechanism. The heterogeneous regions in the microstructure provide the cracks which cause creep crack propagation controlled failures at small strains. Additionally, shear bands nucleate at the heterogeneities, and thereby contribute to damage controlled failure at large strains. The transition in rupture mechanism is associated with a high incidence of creep blunting of cracks at a threshold stress intensity factor.

• Research Organization: Center for Advanced Materials, Lawrence Berkeley Lab.
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 7046038
• Journal Information: J. Mater. Energy Syst.; (United States), Journal Name: J. Mater. Energy Syst.; (United States) Vol. 8:2; ISSN JMSMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CERAMICS
CHALCOGENIDES
CRACK PROPAGATION
CRACKS
CREEP
CRYSTAL STRUCTURE
CRYSTALS
DAMAGE
FAILURES
HETEROGENEOUS EFFECTS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NUCLEATION
OXIDES
OXYGEN COMPOUNDS
POLYCRYSTALS
RUPTURES
SHEAR
STRAINS
STRESS INTENSITY FACTORS
TEMPERATURE EFFECTS