High-temperature precipitation hardening of two-phase Y/sub 2/O/sub 3/-partially-stabilized ZrO/sub 2/ single crystals: A first report

Journal Article · Sat Mar 01 04:00:00 EST 1986 · J. Am. Ceram. Soc.; (United States)

OSTI ID:5898001

Dominguez-Rodriguez, A; Lanteri, V; Heuer, A H

High-temperature plastic deformation of Y/sub 2/O/sub 3/-stabilized ZrO/sub 2/ single crystals is of importance in the general field of oxide plasticity, and to complement the current interest in the strong and tough polycrystalline ceramics that can be produced in this system. Ingel and co-workers have studied the mechanical properties of single crystals in this system and observed unusually high high-temperature strengths in two-phase alloys. Lankford studied the plastic deformation of Y/sub 2/O/sub 3/-partially-stabilized and Y/sub 2/O/sub 3/-fully-stabilized ZrO/sub 2/ in compression between room temperature and 1150/sup 0/C and found that the strengths decreased rapidly with increasing temperature. No tetragonal ..-->.. monoclinic transformations occurred during the deformation of the partially stabilized single crystal. In the present paper, the authors report on the deformation of a crystal containing 4.5 mol% Y/sub 2/O/sub 3/ and being two-phase (high solute cubic (c) ZrO/sub 2/ and low solute tetragonal (t) ZrO/sub 2/ at the deformation temperature (1400/sup 0/C). Precipitation hardening was observed in two-phase (cubic plus tetragonal) Y/sub 2/O/sub 3/-partially-stabilized ZrO/sub 2/ single crystals deformed at 1400/sup 0/C. Slip was activated on (001)(110), primarily in Luders bands.

• Research Organization: Dept. of Metallurgy and Materials Science, Case Western Reserve Univ., Cleveland, OH 44106
• DOE Contract Number: FG02-84ER45110
• OSTI ID: 5898001
• Journal Information: J. Am. Ceram. Soc.; (United States), Journal Name: J. Am. Ceram. Soc.; (United States) Vol. 69:3; ISSN JACTA
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360201* -- Ceramics
Cermets
& Refractories-- Preparation & Fabrication
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
CERAMICS
CHALCOGENIDES
CRYSTALS
HARDENING
MONOCRYSTALS
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PRECIPITATION HARDENING
SLIP
STABILIZATION
TEMPERATURE EFFECTS
TRANSITION ELEMENT COMPOUNDS
VERY HIGH TEMPERATURE
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES