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Plasticity of MoSi2 Below 900°C

Published online by Cambridge University Press:  25 February 2011

H. Chang  and
R. Gibala
H. Chang
Affiliation:
Department of Materials Science and EngineeringUniversity of Michigan, Ann Arbor, MI 48109
R. Gibala
Affiliation:
Department of Materials Science and EngineeringUniversity of Michigan, Ann Arbor, MI 48109
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Abstract

The mechanical behavior of polycrystalline MoSi2 tested in compression at temperatures from 750°C to 950°C has been investigated. This material can be deformed to several percent strain without fracture at temperatures as low as 900°C. This same material prestrained at 1300°C and subsequently tested at lower temperatures can be deformed to substantial strain at 800°C, and even exhibits modest plasticity at 750°C. Both prestrained and unprestrained materials exhibit microcracking combined with dislocation substructures containing high densities of dislocations. Unprestrained MoSi2 exhibits a yield point in this temperature range which does not exist when it is prestrained. The stress-strain curves of the prestrained material in this temperature range are similar qualitatively to those of the unprestrained material at 1100°C and above. These observations suggest that at these temperatures MoSi2 is a dislocation density limited material which can deform by dislocation plasticity processes if a sufficient dislocation density is available.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 322: Symposium F – High-Temperature Silicides and Refractory Alloys , 1993 , 223
Copyright
Copyright © Materials Research Society 1994

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References

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