Abstract
The interfacial fracture behavior of the solid solution directionally solidified eutectic oxide, Co 1-xNi xO/ZrO 2(CaO), is investigated via indentation testing. An abrupt transition from interfacial delamination to interfacial penetration is observed as a function of NiO fraction (x>0.33). The use of a focused ion beam technique is introduced as a means for exploring sub-surface cracking in brittle materials. The sub-surface observations revealed a compositional transition from energy dissipative mechanisms (e.g., delamination, secondary cracking) for cracking to brittle cracking behavior, in the Co 1-xNi xO phase. It is proposed that the transition in interfacial fracture behavior for the directionally solidified eutectic material is the result of competing dislocation-based crack nucleation mechanisms. The observations and analyses have significant implications for fracture behavior in composites with one phase exhibiting (pseudo-) plastic behavior.
Original language | English (US) |
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Pages (from-to) | 3781-3791 |
Number of pages | 11 |
Journal | Acta Materialia |
Volume | 52 |
Issue number | 13 |
DOIs | |
State | Published - Aug 2 2004 |
Keywords
- Eutectic
- Focused ion beam
- Fracture
- Indentation
- Interfaces
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Ceramics and Composites
- Polymers and Plastics
- Metals and Alloys