Impression and Compression Creep of SiAlON Ceramics
- Resource Type
- Authors
- Elizabeth C. Dickey; John R. Hellmann; Kevin M. Fox; David L. Shelleman; Russell L. Yeckley; David J. Green
- Source
- Journal of the American Ceramic Society. 89:2555-2563
- Subject
- Sialon
Materials science
Intergranular corrosion
Focused ion beam
Impression
Stress field
Creep
Transmission electron microscopy
visual_art
Materials Chemistry
Ceramics and Composites
visual_art.visual_art_medium
Forensic engineering
Ceramic
Composite material
- Language
- ISSN
- 1551-2916
0002-7820
Concurrent impression and uniaxial compression creep studies were performed on three Yb-SiAlON materials. Stress exponents were approximately 1 in compression and 2 in impression. The higher stress exponents were due to the complex stress field in the impression creep test, which caused microstructural dilation. The dilated multi-grain junctions also became filled with additional intergranular glassy phase. Focused ion beam milling and in situ lift-out specimen preparation combined with transmission electron microscopy was successful in identifying microstructural changes after creep testing. These observations have important implications in the design of creep-resistant materials in complex stress fields.