Effect of a liquid phase on superplasticity of 2-mol%-Y sub 2 O sub 3 -stabilized tetragonal zirconia polycrystals

Journal Article · Fri Jun 01 04:00:00 EDT 1990 · Journal of the American Ceramic Society; (USA)

DOI:https://doi.org/10.1111/j.1151-2916.1990.tb09806.x· OSTI ID:6339368

Hwang, C M.J.; Chen, I W ^[1]

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1. Michigan Univ., Ann Arbor, MI (USA). Dept. of Materials Science and Engineering

This paper discusses how a small addition of CuO to 2-mol%-Y{sub 2}O{sub 3}-stabilized tetragonal zirconia polycrystals significantly enhances superplasticity by forming an amorphous grain-boundary phase containing primarily Cu{sup +}, Y{sup 3+}, Zr{sup 4+}, and O{sub 2{minus}}. This phase apparently melts at around 1130{degrees}C, but it already provides a fast diffusion path even below the melting temperature. There are abrupt changes in stress exponent, activation energy, and grain size exponent across the melting temperature. Superplasticity is diffusion-controlled below the melting temperature and is interfaced-controlled above that.

• OSTI ID: 6339368
• Journal Information: Journal of the American Ceramic Society; (USA), Journal Name: Journal of the American Ceramic Society; (USA) Vol. 73:6; ISSN JACTA; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
360203* -- Ceramics
Cermets
& Refractories-- Mechanical Properties
656002 -- Condensed Matter Physics-- General Techniques in Condensed Matter-- (1987-)
656003 -- Condensed Matter Physics-- Interactions between Beams & Condensed Matter-- (1987-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
CHARGED PARTICLES
COPPER COMPOUNDS
COPPER IONS
COPPER OXIDES
CREEP
CRYSTAL DOPING
CRYSTAL LATTICES
CRYSTAL STRUCTURE
CRYSTALS
DIFFUSION
EPITAXY
GRAIN BOUNDARIES
IONS
LIQUID PHASE EPITAXY
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PLASTICITY
POLYCRYSTALS
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM IONS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM IONS
ZIRCONIUM OXIDES