Influence of amorphous grain boundary phases on the superplastic behavior of 3-mol%-yttria-stabilized tetragonal zirconia polycrystals (3Y-TZP)

Journal Article · Thu Jul 01 00:00:00 EDT 1993 · Journal of the American Ceramic Society; (United States)

DOI:https://doi.org/10.1111/j.1151-2916.1993.tb06635.x· OSTI ID:6134649

Gust, M; Goo, G; Wolfenstine, J; Mecartney, M L ^[1]

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1. Univ. of California, Irvine, CA (United States). Dept. of Mechanical and Aerospace Engineering

Amorphous silicate grain boundary phases of varying chemistry and amounts were added to 3Y-TZP in order to determine their influence on the superplastic behavior between 1,200 and 1,300C and on the room-temperature mechanical properties. Strain rate enhancement at high temperatures was observed in 3Y-TZP containing a glassy grain boundary phase, even with as little as 0.1 wt% glass. Strain rate enhancement was greatest in 3Y-TZP with 5 wt% glass, but the room-temperature hardness, elastic modulus, and fracture toughness were degraded. The addition of glassy grain boundary phases did not significantly affect the stress exponent of 3Y-TZP, but did lower the activation energy for superplastic flow. Strain rate enhancement was highest in samples containing the grain boundary phase with the highest solubility for Y[sub 2]O[sub 3] and ZrO[sub 2], but the strain rate did not scale inversely with the viscosity of the silicae phases. Grain boundary sliding accommodated by diffusional creep controlled by an interface reaction is proposed as the mechanism for superplastic deformation in 3Y-TZP with and without glassy grain boundary phases.

• OSTI ID: 6134649
• Journal Information: Journal of the American Ceramic Society; (United States), Vol. 76:7; ISSN 0002-7820
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
YTTRIUM OXIDES
MECHANICAL PROPERTIES
MICROSTRUCTURE
ZIRCONIUM OXIDES
AMBIENT TEMPERATURE
AMORPHOUS STATE
CREEP
ELASTICITY
EXPERIMENTAL DATA
FRACTURE PROPERTIES
GRAIN BOUNDARIES
HARDNESS
PLASTICITY
POLYCRYSTALS
STRAIN RATE
TEMPERATURE RANGE 1000-4000 K
CHALCOGENIDES
CRYSTALS
DATA
INFORMATION
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
TEMPERATURE RANGE
TENSILE PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
ZIRCONIUM COMPOUNDS
360203* - Ceramics
Cermets
& Refractories- Mechanical Properties
360202 - Ceramics
Cermets
& Refractories- Structure & Phase Studies