Ferroelastic domain switching in polydomain tetragonal zirconia single crystals

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1989.tb06038.x· OSTI ID:7225175

Srinivasan, G V; Jue, J F; Kuo, S Y; Virkar, A V ^[1]

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1. Utah Univ., Salt Lake City, UT (USA). Dept. of Materials Science and Engineering

As-received, yttria-doped (4.2 wt% Y{sub 2}O{sub 3}) single crystals of zirconia were heated to {ge}2100{degrees}C in air. Cube-shaped samples with faces perpendicular to (100) axes on the basis of the pseudocubic symetry were cut from the crystals. X-ray and electron diffraction indicate that the crystals are polydomain with (001) axes, on the basis of the tetragonal symmetry, in three mutually orthogonal directions (perpendicular to the cube faces). The cube-shaped crystals were tested in compression at temperatures as high as 1400{degrees}C. X-ray diffraction indicated that ferroelastic domains underwent reorientation (switching) in compression. Subsequently, notched samples with the long direction of the beams along (100) on the basis of the pseudocubic symmetry were fractured in three-point bending at temperatures as high as 1000{degrees}C. X-ray diffraction from fracture surfaces showed that domain reorientation had occurred and that no monoclinic phase was observed on fracture or ground surfaces. The fracture toughness at room temperature and at 1000{degrees} was {approximately}12 and {approximately}8 MPa {center dot} m{sup 1/2}, respectively. Preliminary experiments on polycrystalline tetragonal zirconia samples containing 5.4 wt% Y{sub 2}O{sub 3} and sintered at {>=}2100{degrees}C also showed no evidence of the monoclinic phase on fracture or ground surfaces. The toughness of the polycrystalline samples was typically 7.7 NPa {center dot} m{sup 1/2}. These results indicate that ferroelastic domain switching can occur during fracture and may contribute to toughness.

• OSTI ID: 7225175
• Journal Information: Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 72:11; ISSN 0002-7820; ISSN JACTA
• Country of Publication: United States
• Language: English

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71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ANNEALING
CHALCOGENIDES
COHERENT SCATTERING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIFFRACTION
DOMAIN STRUCTURE
FERROMAGNETISM
FRACTURE PROPERTIES
HEAT TREATMENTS
MAGNETISM
MECHANICAL PROPERTIES
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
POLYCRYSTALS
SCATTERING
SYMMETRY
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
X-RAY DIFFRACTION
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES