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Control of Interfacial Mechanical Properties in Ti/Al203 Composites

Published online by Cambridge University Press:  21 February 2011

Hsin-Fu Wang ,
William W. Gerberich ,
Jim E. Angelo  and
Mike J. Mills
Hsin-Fu Wang
Affiliation:
University of Minnesota, Minneapolis, MN 55455.
William W. Gerberich
Affiliation:
University of Minnesota, Minneapolis, MN 55455.
Jim E. Angelo
Affiliation:
Sandia National Laboratories, Livermore, CA 94550.
Mike J. Mills
Affiliation:
Sandia National Laboratories, Livermore, CA 94550.
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Abstract

The fracture energy of Ti/Al203 composite interfaces has been determined by four point bending tests of sandwich specimens for different thicknesses of metal interlayers at 900°C. The interfacial fracture was found to be brittle. An intermetallic reaction product (Ti3Al) was produced at the interface after the diffusion bonding process. When the metal interlayer is thicker, there is more plastic energy dissipation in the metal during the fracture process. Therefore, the interfacial fracture energy increases. This can be seen from the fact that there is a larger plastic zone size with increasing thickness of the metal interlayer. The measured interfacial fracture energy Ti/Al203 ranges from 9.6 J/m2to 45.1 J/m2. The intrinsic interfacial fracture energy is obtained to be 0.26 J/m2. The embrittlement of the interface after the diffusion bonding process causes this value to be smaller than work of adhesion for Ti/Al203 (2.0 J/m2).

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 318: Symposium Ca – Interface Control of Electrical, Chemical, and Mechanical Properties , 1993 , 375
Copyright
Copyright © Materials Research Society 1994

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References

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