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Thermal Fatigue of MoSi2 Particulate and Short Fiber Composites

Published online by Cambridge University Press:  15 February 2011

M. T. Kush ,
J. W. Holmes  and
R. Gibala
M. T. Kush
Affiliation:
The University of Michigan, Department of Materials Science and Engineering, Ann Arbor, MI 48 109-2136
J. W. Holmes
Affiliation:
The University of Michigan, Department of Mechanical Engineering and Applied Mechanics, Ann Arbor, MI148 109-2125
R. Gibala
Affiliation:
The University of Michigan, Department of Materials Science and Engineering, Ann Arbor, MI 48 109-2136
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Abstract

Induction heating of disk shaped specimens was used to compare and contrast the thermal fatigue behavior of MoSi2 and MoSi2-based composites. Specimens were subjected to 5 s heating and cooling cycles between temperature limits of 700°C and 1200°C. The monolithic material and a MoSi2- 10 vol% TiC composite exhibited poor thermal shock resistance and could not be thermally cycled according to this temperature-time profile. A 30 vol% TiC composite exhibited much better thermal shock and thermal fatigue resistance as compared to the monolithic material, but exhibited undesirable oxidation. MoSi2-10 and 30 vol% SiC particulate composites exhibited excellent thermal shock and thermal fatigue resistance compared to that of the monolithic material. A MoSi2-10 vol% SiC whisker composite did not show improved thermal fatigue resistance due to the initial processing defects present in the material. The monolithic material and the 10 vol% TiC composite were also subjected to 30 s heating and cooling cycles between temperature limits of 700°C and 1200°C. Both of these materials exhibited better thermal fatigue resistance at this temperature-time profile, but the 10 vol% TiC composite also exhibited undesirable oxidation. The fatigue results are discussed with reference to the initial microstructure of the specimens and the stress-strain history of the specimens which was obtained by a thermoelastic finite element analysis.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 350: Symposium U – Intermetallic Matrix Composites III , 1994 , 189
Copyright
Copyright © Materials Research Society 1994

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