Strength and Microstructure of Ceramics.
Final technical rept. 1 Oct 1989-30 Sep 1991
NATIONAL INST OF STANDARDS AND TECHNOLOGY GAITHERSBURG MD CERAMICS DIV
Pagination or Media Count:
Results of a program on the toughness properties of monophase and two phase ceramics that toughen by bridging are presented. Fracture mechanics models describing this behavior, in the particular context of strength, are developed. Results of strengths tests confirming the essential predictions of the theory are presented. Innovative processing routes suggested by the models are shown to lead to two phase composites with impressive flaw insensitivity. A partial list of publications included in this report are 1 The role of crystallization of an intergranular glassy phase in determining grain boundary residual stresses in debased aluminas 2 In situ measurements of bridged crack interfaces in scanning electron microscopes 3 Cyclic fatigue from frictional degradation at bridging grains in alumina 4 Microstructure, toughness curves and mechanical properties of alumina ceramics 5 Fabrication of flaw tolerant aluminum titanate reinforced alumina and 6 Influence of grain size and degree of crystallization of intergranular glassy phase on the mechanical behaviour of a debased alumina.
- *CERAMIC MATERIALS
- *COMPOSITE MATERIALS
- GRAIN SIZE
- ALUMINUM OXIDES
- RESIDUAL STRESS
- GRAIN BOUNDARIES
- SCANNING ELECTRON MICROSCOPY
- TEST AND EVALUATION
- MECHANICAL PROPERTIES
- Ceramics, Refractories and Glass