Crack-interface interactions in a tungsten-yttria-stabilized-zirconia directionally solidified eutectic
- Northwestern Univ., Evanston, IL (United States)
- Georgia Inst. of Tech., Atlanta, GA (United States). School of Materials Science and Engineering
A directionally solidified eutectic (DSE) of W-ZrO{sub 2}(Y{sub 2}O{sub 3}) consists of faceted fibers of tungsten embedded in yttria-stabilized cubic zirconia. The W-ZrO{sub 2} interfaces in this system are devoid of any impurity phases of a reaction product. Microindentation-induced cracks and their interactions with interphase interfaces are investigated using scanning and transmission electron microscopy. Crack-interface interactions are found to fall into one of four categories: propagation along the meta-ceramic interface, deflection away from the interface, crack-interface bridging, and shearing of tungsten fibers. Further crack propagation is investigated in situ in a TEM with a propagation induced by local electron beam heating. These crack path selections are analyzed within the framework of phenomenological understanding of crack-interface interactions in composites.
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 211701
- Journal Information:
- Journal of the American Ceramic Society, Journal Name: Journal of the American Ceramic Society Journal Issue: 2 Vol. 79; ISSN 0002-7820; ISSN JACTAW
- Country of Publication:
- United States
- Language:
- English
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