Microstructural aspects of superplastic tensile deformation and cavitation failure in a fine-grained yttria stabilized tetragonal zirconia

Journal Article · Sat Nov 30 23:00:00 EST 1991 · Acta Metallurgica; (United States)

DOI:https://doi.org/10.1016/0956-7151(91)90057-8· OSTI ID:6986570

Schissler, D J; Chokshi, A H ^[1]; Nieh, T G; Wadsworth, J ^[2]

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1. California Univ., San Diego, La Jolla, CA (United States). Dept. of Applied Mechanics and Engineering Sciences
2. Lockheed Missiles and Space Co., Inc., Palo Alto, CA (United States). Research and Development Div.

A fine-grained yttria stabilized tetragonal zirconia exhibits an optimum superplastic elongation to failure of [approximately]700% at 1823 K and a strain rate of 8.3 [times] 10[sup [minus] 5]S[sup [minus] 1]. A detailed microstructural investigation of the superplastically deformed specimens reveals the occurrence of extensive concurrent grain growth and internal cavitation. An expression is developed to characterize the extent of deformation enhanced concurrent grain growth, as influenced by experimental factors such as true stain, strain rate and temperature. The variation in the level of concurrent cavitation with strain rate conforms closely to the variation in elongation to failure with strain rate. In this paper it is demonstrated that the tendency towards cavity interlinkage in a direction perpendicular to the tensile axis is an important factor influencing the total elongation to failure obtained in superplastic materials.

• OSTI ID: 6986570
• Journal Information: Acta Metallurgica; (United States), Journal Name: Acta Metallurgica; (United States) Vol. 39:12; ISSN 0001-6160; ISSN AMETAR
• 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
360204 -- Ceramics
Cermets
& Refractories-- Physical Properties
ALLOYS
CAVITATION
CHALCOGENIDES
CHEMICAL COMPOSITION
CRYSTAL LATTICES
CRYSTAL STRUCTURE
DATA
DEFORMATION
EXPERIMENTAL DATA
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INFORMATION
MATERIALS
MECHANICAL PROPERTIES
MICROSTRUCTURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
PHYSICAL PROPERTIES
TENSILE PROPERTIES
TETRAGONAL LATTICES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
YTTRIUM ADDITIONS
YTTRIUM ALLOYS
ZIRCONIUM COMPOUNDS
ZIRCONIUM OXIDES