Interfacial and near interfacial crack growth phenomena in metal bonded alumina Page: 4 of 120
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Interfacial and Near Interfacial Crack Growth Phenomena
in Metal Bonded Alumina
Jamie Joseph Kruzic
Doctor of Philosophy
Engineering - Materials Science and Mineral Engineering
University of California, Berkeley
Professor Robert O. Ritchie, Chair
This study examines the mechanisms of interfacial and near interfacial crack
propagation associated with the failure of sandwich specimens consisting of 99.5% pure
polycrystalline alumina: 1) liquid state bonded with 99.999% pure aluminum layers and
2) partial transient liquid phase (PTLP) bonded using copper/niobium/copper interlayers.
For the former system, the aluminum layer thickness was varied from 5 to 100 m; it was
found that the 3-point unnotched bending strength of the aluminum bonded joints
increased, and the fracture toughness decreased, with decreasing layer thickness.
Strength beams failed by ductile failure in the aluminum while fracture toughness
samples failed by brittle fracture in the alumina. Under cyclic loading, crack growth
occurred primarily by separating the aluminum from the alumina with evidence of ductile
fatigue striations; cracks deviated into the alumina only for thin layered samples at high
driving forces. Cyclic fatigue thresholds increased with decreasing layer thickness;
however, the change to a brittle fatigue mechanism for thin layered samples at high
driving forces was detrimental to the overall fatigue resistance. Under static loading in
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Kruzic, Jamie Joseph. Interfacial and near interfacial crack growth phenomena in metal bonded alumina, thesis or dissertation, March 1, 2002; Berkeley, California. (digital.library.unt.edu/ark:/67531/metadc742434/m1/4/: accessed April 27, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.