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Film Softening Effects of ZrO2 on MoSi2

Published online by Cambridge University Press:  25 February 2011

C. M. Czarnik ,
R. Gibala ,
M. Nastasi  and
J. D. Garrett
C. M. Czarnik
Affiliation:
The University of Michigan, Department of Materials Science and Engineering, Ann Arbor, MI 48109-2136
R. Gibala
Affiliation:
The University of Michigan, Department of Materials Science and Engineering, Ann Arbor, MI 48109-2136
M. Nastasi
Affiliation:
Materials Science Technology Div., Los Alamos National Laboratory, Los Alamos, NM 87545
J. D. Garrett
Affiliation:
Institute for Materials Research, McMaster University, Hamilton ONT, Canada, L8S 4M1
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Abstract

We have investigated the effect of thin films of ZrO2 on the mechanical behavior of [001] single-crystalline MoSi2. Previous work in our laboratories has shown there to be a 20-40% reduction in hardness in coated samples relative to the corresponding uncoated samples. We now compare fracture around the indentations as a function of thickness. Thicker ZrO2 coatings reduce radial crack length around the indentation through the intrinsic compressive stress at the film/substrate interface. In addition, ZrO2-coated materials tested in compression at 1250°C exhibit approximately twice the plastic strain of uncoated materials, indicating that reduction in hardness is associated with enhanced plasticity from dislocation activity associated with the film/substrate interface.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 185
Copyright
Copyright © Materials Research Society 1994

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