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On the Mechanics of Failure in Ceramic/Metal Bonded Systems

Published online by Cambridge University Press:  22 February 2011

Anthony G. Evans  and
M. Ruhle
Anthony G. Evans
Affiliation:
Materials and Molecular Research Division, Lawrence Berkeley Laboratory, Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720
M. Ruhle
Affiliation:
Max Planck Institut fur Metallforschung, Institut fur Werkstoffwissenschaften, Stuttgart, Federal Republic of Germany
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Abstract

Stress concentrations that develop in metal/ceramic bonded systems have been evaluated and shown to encourage crack propagation at, or near, the edge of bonded interfaces. Experimental indentation observations on Nb/Al2O3 confirm the existence of the predicted stress concentrations. In this system, failure was invariably observed to initiate in the ceramic, such that quasi-static cracks located at the interface exhibited crack blunting. However, substantial dynamic reductions in the crack growth resistance of the interface are inferred from fracture surface observations. Implications for the optimal strengths of ceramic/metal bonded systems are presented.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 40: Symposium J – Electronic Packaging Materials Science I , 1984 , 153
Copyright
Copyright © Materials Research Society 1985

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