Superplastic flow in nanocrystalline and sub-microcrystalline yttria-stabilized tetragonal zirconia

Tensile deformation of nanocrystalline ZrO2 + 5 mol% Y2O3 at temperatures in the range of 1283–1403 K is described. It is demonstrated (a) that steady state flow is possible at temperatures of the order of 0.42 Tm, where Tm is the absolute melting point, (b) that 70% engineering strain could be obta...

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Bibliographic Details
Published in:Journal of materials science 2001-01, Vol.36 (24), p.5811-5821
Main Authors: BETZ, U, PADMANABHAN, K. A, HAHN, H
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Chemical industry and chemicals
Equilibrium flow
Exact sciences and technology
Grain boundaries
Grain boundary sliding
Grain growth
Materials science
Melting points
Miscellaneous
Nanocrystals
Superplasticity
Technical ceramics
Tensile deformation
Tetragonal zirconia
Yttria-stabilized zirconia
Yttrium oxide
Zirconium dioxide
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Summary:Tensile deformation of nanocrystalline ZrO2 + 5 mol% Y2O3 at temperatures in the range of 1283–1403 K is described. It is demonstrated (a) that steady state flow is possible at temperatures of the order of 0.42 Tm, where Tm is the absolute melting point, (b) that 70% engineering strain could be obtained at 1403 K (0.46 Tm), and (c) that significant grain boundary sliding was present during deformation. Static and dynamic grain growth as also a decrease in the relative density of the specimen with deformation could be observed. The present results as well as those of Owen and Chokshi concerning superplastic flow in sub-microcrystalline materials taken from literature could be accounted for quantitatively using the grain boundary sliding controlled flow model of Padmanabhan and Schlipf, originally proposed for microcrystalline superplastic alloys.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1012956005571