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Crack‐Interface Interactions in a Tungsten‐Yttria‐Stabilized‐Zirconia Directionally Solidified Eutectic
Author(s) -
Isabell Thomas C.,
Dravid Vinayak P.,
Hill D. Norman
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08137.x
Subject(s) - materials science , eutectic system , composite material , tungsten , cubic zirconia , transmission electron microscopy , yttria stabilized zirconia , fracture mechanics , scanning electron microscope , ceramic , metallurgy , microstructure , nanotechnology
A directionally solidified eutectic (DSE) of W‐ZrO 2 (Y 2 O 3 ) consists of faceted fibers of tungsten embedded in yttriastabilized cubic zirconia. The W‐ZrO 2 interfaces in this system are devoid of any impurity phases or 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 metal‐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 phenoin‐enological understanding of crack‐interface interactions in composites.