Superplastic ceramics

Journal Article · Mon Jan 01 04:00:00 EST 1990 · Annual Review of Materials Science; (United States)

DOI:https://doi.org/10.1146/annurev.ms.20.080190.001001· OSTI ID:5362327

Nieh, T G; Wadsworth, J ^[1]

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1. Lockheed Missles and Space Co., Inc., Palo Alto, CA (US)

Despite the extensive studies of superplastic behavior in metallic systems, only very limited work has been performed on ceramics or ceramic composites. The demonstration of true superplastic behavior in ceramics is of very recent origin. The ceramic-base materials made superplastic to date are based on the principles developed for metallic alloys and claims of observations of both types of superplasticity have been made for ceramic materials. The purpose of this paper is to summarize recent work on superplastic behavior in ceramics and ceramic composites and comment on related work in intermetallics, geological materials, and nanophase materials. So far, only limited work has demonstrated superplastic behavior in tension in fine-grained, fully polycrystalline ceramics. It is noted that the grain sizes required for fine grain superplasticity are about 10 {mu}m or less for metals, but about 1 {mu}m or less for ceramics. Three fine-grained polycrystalline ceramics in which superplasticity has been demonstrated in tension are 3 mol% yttria-stabilized tetragonal zirconia polycrystal (Y-TZP), Y-TZP containing 20 wt% Al{sub 2}O{sub 3} particles (Al{sub 2}O{sub 3}/YTZ), and Al{sub 2}O{sub 3}.

• OSTI ID: 5362327
• Journal Information: Annual Review of Materials Science; (United States), Journal Name: Annual Review of Materials Science; (United States) Vol. 20; ISSN 0084-6600; ISSN ARMSC
• 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
CERAMICS
CHALCOGENIDES
COMPOSITE MATERIALS
CRYSTAL STRUCTURE
CRYSTALS
GRAIN SIZE
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
PLASTICITY
POLYCRYSTALS
SIZE
TRANSITION ELEMENT COMPOUNDS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES