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Creep Behavior of MoSi2 with Si3N4 Reinforcements

Published online by Cambridge University Press:  15 February 2011

C. R. Feng  and
K. Sadananda
C. R. Feng
Affiliation:
Naval Research Laboratory, Material Science and Technology Division, Washington, DC 20375–5343, [email protected]
K. Sadananda
Affiliation:
Naval Research Laboratory, Material Science and Technology Division, Washington, DC 20375–5343, [email protected]
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Abstract

Because of its high melting point, excellent oxidation resistance and ductility at high temperatures, MoSi2 and its composites are attractive for elevated temperature applications. In this study, the compression creep behavior of hot pressed MoSi2 with various volume fraction of Si3N4 at 1200°C, 1300°C and 1400°C were investigated. Within the stress range of 115–425MPa, the stress exponent, n, was either 1 or 5 depended on the volume fraction of Si3N4. The activation energy of creep for MoSi2-50%Si3N4 composite was 750kJ/mol. At still higher volume fraction of Si3N4, the activation energy decreases to 693kJ/mol, which is the same as that for monolithic Si3N4.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 460: Symposium Z – High-Temperature Ordered Intermetallic Alloys VII , 1996 , 665
Copyright
Copyright © Materials Research Society 1997

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References

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