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Metal ceramic interface toughness II: Mechanisms of fracture and energy dissipation

Published online by Cambridge University Press:  31 January 2011

J. D. Kiely  and
D. A. Bonnell
J. D. Kiely
Affiliation:
The University of Pennsylvania, Philadelphia Pennsylvania 19104
D. A. Bonnell
Affiliation:
The University of Pennsylvania, Philadelphia Pennsylvania 19104
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Abstract

Based on observations of plasticity on fracture surfaces, we propose two fracture mechanism for Ni-sapphire interfaces. A brittle-type mechanism is proposed for the decohesion of Ni from sapphire by which cracks advance in increments of 20 nm. When particulates that increase the interface strength are present, debonding occurs at the leading edge of the particulate, and unsteady crack advance occurs. Additionally, toughening mechanisms are proposed for each type of plasticity feature observed, and the fracture energy of each mechanism is quantified. Comparison of energy dissipated by these mechanisms with measured fracture energies indicates how the fracture energy of the interface varies with sulfur segregation and environmental embrittlement.

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Articles
Information
Journal of Materials Research , Volume 13 , Issue 10 , October 1998 , pp. 2881 - 2887
Copyright
Copyright © Materials Research Society 1998

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