Superplasticity of yttria-stabilized tetragonal ZrO2 polycrystals

Journal Article · Tue Jul 01 00:00:00 EDT 1986 · Adv. Cer. Mat.; (United States)

OSTI ID:5027888

Wakai, F; Sakaguchi, S; Matsuno, Y

The uniaxial tensile deformation behavior of 3 molpercent Y/sub 2/O/sub 3/-tetragonal ZrO/sub 2/ polycrystals was studied at temperatures up to 1500 C in ambient atmosphere. The tensile specimens which were elongated at constant displacement rates from 0.00011/s to 0.00055/s at 1450 C exhibited unusually large deformation. The superplastically deformed specimens retained a bending strength of 976 MPa at room temperature. Steady creep rates measured at a constant load in the range of relatively small strains were described by a stress component, n, of 2 and by an activation energy of 586 + or - 40 kJ/mol. Large deformations during the accelerating creep were accompanied by extensive formation of cavities. 19 references.

• Research Organization: Government Industrial Research Institute, Nagoya, Japan
• OSTI ID: 5027888
• Journal Information: Adv. Cer. Mat.; (United States), Vol. 1
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ZIRCONIUM OXIDES
DEFORMATION
CREEP
GRAIN BOUNDARIES
GRAIN SIZE
MICROSTRUCTURE
PLASTICITY
POLYCRYSTALS
STRAIN RATE
YTTRIUM OXIDES
CHALCOGENIDES
CRYSTAL STRUCTURE
CRYSTALS
MECHANICAL PROPERTIES
OXIDES
OXYGEN COMPOUNDS
SIZE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties