Abstract
High temperature cyclic crack growth experiments were conducted on polycrystalline Al2O3 of different grain sizes. The effect of grain size depended on the level of applied stress intensity. At high stress intensifies, a larger grain size provided a superior crack growth resistance, similar to the effect of grain size on crack growth at room temperature. However, at low stress intensities, the grain-size dependence was reversed. While the effect of grain size at high stress intensities resulted from enhanced grain bridging in the coarse-grained microstructure, the behavior at low stress intensifies can be understood in terms of the higher grain boundary strength of the fine-grained structure.
Original language | English (US) |
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Pages (from-to) | 642-650 |
Number of pages | 9 |
Journal | Ceramic Engineering and Science Proceedings |
Volume | 15 |
Issue number | 5 |
State | Published - Sep 1994 |
Event | Proceedings of the 18th Annual Conference on Composites and Advanced Ceramic Materials - B. Part 2 (of 2) - Cocoa Beach, FL, USA Duration: Jan 9 1993 → Jan 14 1993 |
ASJC Scopus subject areas
- Ceramics and Composites
- Materials Chemistry