Fatigue-crack growth and fracture properties of coarse and fine-grained Ti3SiC2
| Autor: | D.R. Bloyer, C. J. Gilbert, Antoni P. Tomsia, Tamer El-Raghy, Michel W. Barsoum, Robert O. Ritchie |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Materials science
Mechanical Engineering Metallurgy Metals and Alloys Fracture mechanics Paris' law Condensed Matter Physics Hot pressing Microstructure Grain size Fracture toughness Mechanics of Materials visual_art visual_art.visual_art_medium Fracture (geology) General Materials Science Ceramic Composite material |
| Zdroj: | Scripta Materialia. 42:761-767 |
| ISSN: | 1359-6462 |
| DOI: | 10.1016/s1359-6462(99)00427-3 |
| Popis: | An experimental study of fracture and cyclic fatigue-crack growth behavior was made in a reactively hot-pressed monolithic Ti{sub 3}SiC{sub 2} ceramic with both fine (3--10 {mu}m) and coarse-grained (50--200 {mu}m) microstructures. Whereas the fine-grained microstructure exhibited a steady-state (plateau) R-curve fracture toughness of K{sub c} {approximately} 9.5 MPa{radical}m, the coarse-grained Ti{sub 3}SiC{sub 2} exhibited a K{sub c} {approximately}16 MPa{radical}m. The latter value is though to be one of the highest fracture toughnesses ever observed in a monolithic, non-transforming ceramic, consistent with the profusion of crack-bridging processes active in the crack wake. Moreover, fatigue-crack growth thresholds, {Delta}K{sub TH}, were comparatively high for ceramic materials, as indicated by the coarse-grained microstructure which had a threshold {Delta}K{sub TH} of {approximately}9 MPa{radical}m. Such fatigue crack growth was associated with substantial evidence for wear degradation at active bridging sites behind the crack tip. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect