Journal
CERAMICS INTERNATIONAL
Volume 37, Issue 2, Pages 647-650Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.ceramint.2010.10.002
Keywords
LiTaO3/Al2O3 composite ceramics; Crack propagation; Domain switching; Toughening mechanism; Transmission electron microscopy (TEM)
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Funding
- National Natural Science Foundation of China [50602041]
- New Star Technology Plan of Beijing [2007A080]
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Direct observation of crack propagation in LiTaO3/Al2O3 composite ceramics was carried out using in situ transmission electron microscopy (TEM). Domain switching induced by crack propagation, crack deflection and branching at domain boundaries and ripples similar to the contrasts of 180 degrees domains at the microcrack tip inside LiTaO3 grains were detected evidently. Domain switching, crack deflection, branching and energy dissipation resulting from the formation of contrasts similar to the 180 degrees domains at the microcrack tip, were proposed as the toughening mechanisms in LiTaO3/Al2O3 ceramics. (C) 2010 Elsevier Ltd and Techna Group S.r.l. All rights reserved.
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