Superplastic flow of mullite-zirconia composites
Mullite-zirconia composites containing up to 50 vol%/o mullite have been superplastically deformed to large strains at relatively low temperatures and stresses. These composites can be sintered at 1400/sup 0/C and have very fine grain sizes. At 1350/sup 0/C, the flow stress of a composite containing 50 vol%/o mullite was 62 MPa at a strain rate of 0.001/s. The strain rate sensitivity is higher than 0.6 in the regime 2 and the grain size sensitivity is 3. The mullite grains behave like hard inclusions in a superplastic Y-TZP matrix. While a threshold stress was found at lower strain rates in regime 1, regime 3 behavior was not apparent up to the highest strain rate tested of 0.007/s. 8 figs.
- Research Organization:
- Michigan Univ., Ann Arbor (USA). Dept. of Materials Science and Engineering
- DOE Contract Number:
- FG02-87ER45302
- OSTI ID:
- 5417817
- Report Number(s):
- CONF-871189-2; ON: DE88005905
- Country of Publication:
- United States
- Language:
- English
Similar Records
Micromechanical and microstructural studies of ceramic superplasticity: Progress report, May 1, 1987-January 31, 1988. [ZrO/sub 2/-mullite; YBa/sub 2/Cu/sub 3/O/sub x/]
An examination of the flow process in superplastic yttria-stabilized tetragonal zirconia
Related Subjects
360203 -- Ceramics
Cermets
& Refractories-- Mechanical Properties
360603* -- Materials-- Properties
CHALCOGENIDES
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
DEFORMATION
FLOW STRESS
GRAIN SIZE
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
MINERALS
MULLITE
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PLASTICITY
SINTERED MATERIALS
SIZE
STRAIN RATE
STRESSES
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES