Mechanical relaxation of 4 wt% Y2O3-ZrO2 tetragonal single crystals |
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Authors: | M Ozawa H Hasegawa |
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Affiliation: | (1) Toyota Central Research and Development Laboratories Inc., Nagakute, 480-11 Aichi, Japan;(2) Present address: Ceramics Research Laboratory, Nagoya Institute of Technology, Tajimi, 507 Gifu, Japan |
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Abstract: | The mechanical relaxation was examined by a resonance piezoelectric method for a 3.5 wt % Y2O3-ZrO2 polycrystal and 4 wt% Y2O3-ZrO2 tetragonal single crystals with orientations in the 100 and 111 directions. The relaxation was observed for the 111 -oriented crystal, but not for the 100 -crystal. The results indicated that the relaxation was active only for the elastic compliance, S44, and inactive for (s
11–s
12). The amplitude of the anelastic relaxation measured for the polycrystalline and the 111 -crystal body was 4.2 × 10–12 m2N–1 and 6.7×10–12 m2 N–1, respectively. An observed broad relaxation peak suggested that complex processes exist even in single crystals. |
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