Elastic behavior of single crystals of yttria-stabilized zirconia
The single-crystalline elastic constants of yttria-stabilized zirconia (YSZ) were determined over the temperature range 20 to 700/sup 0/C by the pulse-echo-overlap technique. Different crystals of YSZ containing 8.1, 11.1, 12.1, 15.5, and 17.9 mol % Y/sub 2/O/sub 3/ were examined. The compositional dependencies of the three independent constants at room temperature show that, upon increasing Y/sub 2/O/sub 3/ content, C/sub 11/ decreases, whereas C/sub 12/ and C/sub 44/ increase. All conventional constants show normal negative temperature dependencies except those of the 8.1 mol % Y/sub 2/O/sub 3/ alloy, which show nonreproducible behaviors at elevated temperatures. Shear anisotropy in YSZ is pronounced and it decreases with increasing Y/sub 2/O/sub 3/ content but increases with temperature. Extrapolation of longitudinal and shear constants along different crystallographic directions at room temperature indicates elastic isotropy near 40 mol % Y/sub 2/O/sub 3/ where a number of investigations have established the presence of an ordered phase (Zr/sub 3/Y/sub 4/O/sub 12/) with a rhombohedral symmetry.
- OSTI ID:
- 6019272
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
CHALCOGENIDES
CHEMICAL COMPOSITION
ELASTICITY
HIGH TEMPERATURE
MECHANICAL PROPERTIES
MEDIUM TEMPERATURE
METALLURGICAL EFFECTS
OXIDES
OXYGEN COMPOUNDS
SHEAR PROPERTIES
TEMPERATURE DEPENDENCE
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES