Mechanical properties of a 20 vol % SiC whisker-reinforced, yttria-stabilized, tetragonal zirconia composite at elevated temperatures

Journal Article · Sun Jan 01 00:00:00 EST 1995 · Journal of Materials Research; (United States)

DOI:https://doi.org/10.1557/JMR.1995.0113· OSTI ID:6654198

Dougherty, S E; Nieh, T G; Wadsworth, J ^[1]; Akimune, Y ^[2]

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1. Lawrence Livermore National Laboratory, P.O. Box 808, L-350, Livermore, California 94551-9900 (United States)
2. Central Engineering Laboratories, Nissan Motor Co., Ltd., Yokosuka 237 (Japan)

The high-temperature deformation behavior of a SiC whisker-reinforced, yttria-stabilized, tetragonal zirconia polycrystalline composite containing 20 vol. % SiC whiskers (SiC/Y-TZP) has been investigated. Tensile tests were performed in vacuum at temperatures from 1450 [degree]C to 1650 [degree]C and at strain rates from 10[sup [minus]3] to 10[sup [minus]5] s[sup [minus]1]. The material exhibits useful high-temperature engineering properties (e.g., [similar to]100 MPa and 16% elongation at [ital T]=1550 [degree]C and at a strain rate of [similar to]10[sup [minus]4] s[sup [minus]1]). The stress exponent was determined to be [ital n][approx]2. Scanning electron microscopy was used to characterize the grain size and morphology of the composites, both before and after deformation. The grain size in the composite was initially fine, but coarsened at the test temperatures; both dynamic and static grain growth were observed. The morphology of ceramic reinforcements appears to affect strongly the plastic deformation properties of Y-TZP. A comparison is made between the properties of monolithic Y-TZP, 20 wt. % Al[sub 2]O[sub 3] particulate-reinforced Y-TZP (Al[sub 2]O[sub 3]/Y-TZP), and SiC/Y-TZP composites.

• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6654198
• Journal Information: Journal of Materials Research; (United States), Vol. 10:1; ISSN 0884-2914
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
COMPOSITE MATERIALS
MECHANICAL PROPERTIES
SILICON CARBIDES
YTTRIUM OXIDES
ZIRCONIUM OXIDES
GRAIN SIZE
MORPHOLOGY
SCANNING ELECTRON MICROSCOPY
TEMPERATURE RANGE 1000-4000 K
TENSILE PROPERTIES
TETRAGONAL LATTICES
WHISKERS
CARBIDES
CARBON COMPOUNDS
CHALCOGENIDES
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
ELECTRON MICROSCOPY
MATERIALS
MICROSCOPY
MICROSTRUCTURE
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
SILICON COMPOUNDS
SIZE
TEMPERATURE RANGE
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
360603* - Materials- Properties