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Microstructural and Chemical Components of Ceramic-Metal Interfacial Fracture Energies

Published online by Cambridge University Press:  25 February 2011

R. M. Cannon
Affiliation:
Center For Advanced Materials, Lawrence Berkeley Laboratory University of California, Berkeley, CA 94720
V. Jayaram
Affiliation:
Center For Advanced Materials, Lawrence Berkeley Laboratory University of California, Berkeley, CA 94720
B. J. Dalgleish
Affiliation:
Center For Advanced Materials, Lawrence Berkeley Laboratory University of California, Berkeley, CA 94720
R. M. Fisher
Affiliation:
Center For Advanced Materials, Lawrence Berkeley Laboratory University of California, Berkeley, CA 94720
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Abstract

Failure of ceramic-metal interfaces induced by residual or applied stress is often brittle in nature although plastic strain in one or more bonding layers may add to the fracture energy for decohesion. Thus, the fracture toughness depends on chemical bonding across the interface, the plasticity and flow stress of the metal as well as other factors, arising from local internal stresses and the microstructure of the ceramic-metal couple, that cause crack tip branching, deflection, bridging, blunting or shielding. Electron microscopy and DCB testing of metal-glass systems provide insights into the relative importance of factors that determine the decohesion resistance.

Type
Articles
Copyright
Copyright © Materials Research Society 1986

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References

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