| About this Abstract |
| Meeting |
MS&T24: Materials Science & Technology
|
| Symposium
|
Engineering Ceramics: Microstructure-Property-Performance Relations and Applications
|
| Presentation Title |
Elucidation of the Mechanism of Initial Low-Temperature Degradation of 3 mol% Y2O3 Stabilized ZrO2 Ceramics by Bending Test Using Microcantilever Beam Specimens |
| Author(s) |
Takuma Takahashi, Kaito Niregi, Tsukaho Yahagi, Tatsuki Ohji, Junichi Tatami |
| On-Site Speaker (Planned) |
Takuma Takahashi |
| Abstract Scope |
The purpose of this study is to measure the mesoscale mechanical property changes of 3 mol% yttria stabilized tetragonal zirconia (3Y-TZP) near the surface by microcantilever tests and to clarify the actual initial degradation under a hydrothermal environment at 150°C. All microcantilever beam specimens were fabricated by focused ion beam (FIB) processing in a crack-free region. After 1 h treatment, the bending strength slightly decreased and the crack propagation path on the specimen surface shifted to the grain boundary. This suggests that the grain boundary is weakened. On the other hand, the nonlinearity of the stress-strain curve and the step before fracture disappeared after hydrothermal treatment. These may reflect the ferroelastic domain switching and the suppression of crack opening due to stress-induced phase transformation of the t-phase. |