Electron microscopic observation of rapidly cooled ZrO2-3 mol% Sm2O3 from the melt |
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| Authors: | M. Hayakawa Y. Onda M. Oka M. Yoshimura M. Yashima |
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| Affiliation: | (1) Department of Mechanical Engineering, Tottori University, Koyama, 680 Tottori, Japan;(2) Present address: Hitachi Metals Co. Ltd, Chiyoda, 100 Tokyo, Japan;(3) Research Laboratory of Engineering Materials, Tokyo Institute of Technology, Nagatsuta, Midori, 4259 Yokohama 227, Japan |
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| Abstract: | Electron microscopic observation was made on ZrO2-3 mol % Sm2O3 specimens prepared from the melt using two different cooling rates, namely rapid quenching using a hammer-anvil apparatus and free cooling on a water-cooled copper hearth. The observed microscopic features, such as fully tetragonal grains with parallel twins or herringbone structure, anti-phase boundary contrast in a dark-field image, tweed structure, etc., were found to be quite similar to those observed in similarly prepared ZrO2-3 mol % Y2O3 specimens. It was specifically noted that the tweed structure, which requires atomic diffusion, was not suppressed by the rapid quenching, indicating a very fast growth rate. Trace analysis was also conducted on the tweed structure observed in freely cooled specimens. |
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