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Journal of Electron Microscopy 51:S135-S141 (2002)
© 2002 Oxford University Press

Full-length paper

TEM and AEM observation of high-strain-rate superplastic ceramics, CaO-/TiO2-doped and CaO-/SiO2-doped (3Y)ZrO2 polycrystals

Yasuyuki Kitano1,*, Kazushi Yamada1, Eishi Tanabe2, Muneo Oka3 and Kousou Nagao3

1Department of Materials Science, Shimane University, Matsue 690-8504, Japan,
2Hiroshima Prefectural Institute of Science and Technology, Higashi-Hiroshima 739-0046-3-10-32 and
3Faculty of Engineering, Tottori University, Tottori 680-8552, Japan

To whom correspondence should be addressed. E-mail: kitano{at}riko.shimane-u.ac.jp

Microstructures of high-strain-rate superplastic ceramics, based on the 3mol% yttria stabilized zirconia polycrystals, (3Y)ZrO2, were investigated by transmission electron microscopy (TEM) and analytical electron microscopy (AEM). Two types of ceramics were studied: (3Y)ZrO2-2mass%CaO-2mass%TiO2 (Sample I) and (3Y)ZrO2-2mass%CaO-6mass%SiO2 (Sample II). Samples were synthesized by the sintering process. Doping CaO, the grain size of the specimen was controlled to keep the size near or less than 300 nm in diameter. While doping TiO2, the boundary gliding process was enhanced during the tensile deformation test at high temperature. Tensile deformation is applied to these samples by an Instron-type testing machine equipped with an electric furnace. The tensile elongation to failure was 404 and 64% for Samples I and II, respectively. For these two types of ceramics, TEM observations were performed and microstructures were compared between as-sintered specimens and as-deformed specimens. In Sample I, grain growth of the zirconia crystals did not occur during the deformation, while in Sample II the grain growth did occur. In the latter, a crystal of zirconium silicate, ZrSiO4, grew in a square shape. Not only the grain growth of zirconia but also the square-shaped single crystal growth are the reasons for poor superplastic property of Sample II.

Keywords     CaO-/TiO2-doped(3Y)ZrO2, CaO-/SiO2-doped(3Y)ZrO2, HRTEM, EDS, plastic deformation, superplasticity


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