Analysis of grain boundaries in a fine-grained, superplastic, yttria-containing, tetragonal zirconia

Journal Article · Fri Dec 01 04:00:00 EST 1989 · Scripta Metallurgica; (USA)

DOI:https://doi.org/10.1016/0036-9748(89)90222-6· OSTI ID:6821459

Nieh, T G; Yaney, D L; Wadsworth, J ^[1]

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1. Lockheed Missiles and Space Co., Inc., Palo Alto, CA (USA). Research and Development Div.

Superplasticity has been observed in several different fine-grained ceramics including yttria-containing tetragonal zirconia polycrystals (Y-TZPs). Evidence for superplasticity in these materials has been obtained both indirectly from compression tests as well as directly from tension tests. A tensile elongation-to-failure of over 800% has now been recorded for a ZrO{sub 2}-5.2wt.%Y{sub 2}O{sub 3} material. Despite the fact that Y-TZPs can exhibit large strains to failure, the exact deformation mechanisms responsible for this behavior are still controversial. The authors discuss how, in order to gain further insight into mechanisms responsible for large tensile elongations, several investigators have attempted to measure the strain rate sensitivity of Y-TZPs at different temperatures.

• OSTI ID: 6821459
• Journal Information: Scripta Metallurgica; (USA), Journal Name: Scripta Metallurgica; (USA) Vol. 23:12; ISSN 0036-9748; ISSN SCRMB
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360102* -- Metals & Alloys-- Structure & Phase Studies
360103 -- Metals & Alloys-- Mechanical Properties
360104 -- Metals & Alloys-- Physical Properties
CHALCOGENIDES
COMPRESSION STRENGTH
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DEFORMATION
GRAIN BOUNDARIES
MATERIALS TESTING
MECHANICAL PROPERTIES
MICROSTRUCTURE
OXIDES
OXYGEN COMPOUNDS
TEMPERATURE EFFECTS
TESTING
TETRAGONAL LATTICES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM COMPOUNDS
YTTRIUM OXIDES
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES