Effect of prestraining on cavity morphology in a superplastic 3 mol% yttria-stabilized tetragonal zirconia (3Y-TZP)

Journal Article · Fri Jun 05 04:00:00 EDT 1998 · Scripta Materialia

DOI:https://doi.org/10.1016/S1359-6462(98)00113-4· OSTI ID:642143

Tekeli, S; Davies, T J ^[1]

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1. Univ. of Manchester/UMIST (United Kingdom). Materials Science Centre

Whereas early studies on superplastic ceramics associated large elongations with an absence of cavitation, recent studies have clearly shown that most ceramics cavitage during superplastic deformation although the level of cavitation varies from one material to another; this cavitation may lead to inferior post-forming properties and premature failure. It is therefore desirable to restrict the concurrent cavitation and retard interlinkage of cavities in a direction perpendicular to the tensile axis during superplastic deformation. Cavitation in metallic alloys can be controlled by various procedures including annealing and/or the application of hydrostatic pressure prior to, during or after superplastic deformation. Only limited quantitative studies have been performed on ceramics, in particular cavitation as a function of strain, strain rate and grain size. The present investigation was undertaken to characterize quantitatively the occurrence of cavitation in superplastic 3Y-TZP as a function of prestraining.

• OSTI ID: 642143
• Journal Information: Scripta Materialia, Journal Name: Scripta Materialia Journal Issue: 1 Vol. 39; ISSN SCMAF7; ISSN 1359-6462
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
DEFORMATION
MICROSTRUCTURE
MORPHOLOGY
PLASTICITY
POROSITY
STRAINS
YTTRIUM OXIDES
ZIRCONIUM OXIDES