Morphologies of monoclinic phase in ZrO2 (2 mol% Y2O3) revealed by TEM in situ continuous observations

TEM in situ continuous observations were made of the tetragonal (t) to monoclinic (m) transformation of ZrO2(2Y) in pure ZrO2(2Y) and Al2O3+25 vol% ZrO2(2Y) ceramics. It was found that there were two morphologies of the m-phase after transformation of the t-grains: N-shaped plate clusters and parall...

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Bibliographic Details
Published in:Journal of materials science 1997, Vol.32 (4), p.1105-1111
Main Authors: LEI, T. C, LIN, G. Y, GE, Q. L, ZHOU, Y, HE, X. J
Format: Article
Language:English
Subjects:
Aluminum oxide
Condensed matter: structure, mechanical and thermal properties
Crystalline state (including molecular motions in solids)
Crystallographic aspects of phase transformations
pressure effects
Exact sciences and technology
Materials science
Morphology
Phase transitions
Physics
Plates
Structure of solids and liquids
crystallography
Yttrium oxide
Zirconium dioxide
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Summary:TEM in situ continuous observations were made of the tetragonal (t) to monoclinic (m) transformation of ZrO2(2Y) in pure ZrO2(2Y) and Al2O3+25 vol% ZrO2(2Y) ceramics. It was found that there were two morphologies of the m-phase after transformation of the t-grains: N-shaped plate clusters and parallel laths. The parallel lath morphology is considered to be the result of lateral growth of the m-plates. The lower the local Y2O3 content, the less will be the stability of the t-phase, and then the larger will be the possibility of the lateral growth of the m-plates. This, in turn, facilitates the transition from N-shaped to parallel lath morphology and increases the completeness of the transformation.
ISSN:0022-2461
1573-4803
DOI:10.1023/A:1018555112020