High-temperature stress-strain behavior of MgO in compression
Conference
·
· J. Am. Ceram. Soc.; (United States)
OSTI ID:5643485
Compressive stress-strain curves for several types of polycrystalline MgO specimens were correlated with those for single crystals and analyzed as a function of grain size and grain-boundary character at 1200 and 1400/sup 0/C for several strain rates. The results for fully dense specimens were explained in terms of grain-boundary sliding and intergrainular separation in addition to slip. The modification of grain-boundary nature concurrent with heat treatment for grain growth, caused by residual Li/F, was associated with enhanced grain-boundary sliding and intergranular separation. For grain sizes < 30 ..mu..m, it was concluded that the von Mises criteria for ductility could be relaxed by the occurrence of dislocation climb and, to a limited extent, by intergranular separation. Yield drop corresponding to dislocation multiplication occurred when grain-boundary sliding was initially promoted. Specimens with a liquid phase of adequate viscosity also indicated plasticity accompanied by high strength. Specimens with clean grain boundaries exhibited ductility and normal strain hardening with no intergraular separation.
- Research Organization:
- Univ. of California, Berkeley
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 5643485
- Conference Information:
- Journal Name: J. Am. Ceram. Soc.; (United States) Journal Volume: 62:9-10
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COMPRESSION
CREEP
CRYSTAL STRUCTURE
DEFORMATION
DUCTILITY
FABRICATION
FRACTURE PROPERTIES
GRAIN BOUNDARIES
GRAIN SIZE
HIGH TEMPERATURE
IMPURITIES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
SIZE
SLIP
STRAIN RATE
STRESSES
SURFACES
TENSILE PROPERTIES
YIELD STRENGTH
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360202* -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
ALKALINE EARTH METAL COMPOUNDS
CHALCOGENIDES
COMPRESSION
CREEP
CRYSTAL STRUCTURE
DEFORMATION
DUCTILITY
FABRICATION
FRACTURE PROPERTIES
GRAIN BOUNDARIES
GRAIN SIZE
HIGH TEMPERATURE
IMPURITIES
MAGNESIUM COMPOUNDS
MAGNESIUM OXIDES
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
SIZE
SLIP
STRAIN RATE
STRESSES
SURFACES
TENSILE PROPERTIES
YIELD STRENGTH