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A new procedure for measuring the decohesion energy for thin ductile films on substrates

Published online by Cambridge University Press:  03 March 2011

A. Bagchi ,
G.E. Lucas ,
Z. Suo  and
A.G. Evans
A. Bagchi
Affiliation:
Materials Department, College of Engineering, University of California-Santa Barbara, Santa Barbara, California 93106–5050
G.E. Lucas
Affiliation:
Materials Department, College of Engineering, University of California-Santa Barbara, Santa Barbara, California 93106–5050
Z. Suo
Affiliation:
Materials Department, College of Engineering, University of California-Santa Barbara, Santa Barbara, California 93106–5050
A.G. Evans
Affiliation:
Materials Department, College of Engineering, University of California-Santa Barbara, Santa Barbara, California 93106–5050
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Abstract

A novel testing technique has been developed capable of measuring the interfacial fracture resistance, Γi, of thin ductile films on substrates. In this technique, the thin film on the substrate is stressed by depositing onto the film a second superlayer of material, having a large intrinsic stress, such as Cr. Subsequent processing defines a precrack at the interface between the film and the substrate. The strain energy available for driving the debond crack is modulated by varying the thickness of the Cr superlayer. Spontaneous decohesion occurs for superlayers exceeding a critical thickness. The latter is used to obtain Γi from elasticity solutions for residually stressed thin films. The technique has been demonstrated for Cu thin films on silica substrates.

Type
Articles
Information
Journal of Materials Research , Volume 9 , Issue 7 , July 1994 , pp. 1734 - 1741
Copyright
Copyright © Materials Research Society 1994

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