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Creep Mechanisms in Niobium-Silicide Based In-Situ Composites

Published online by Cambridge University Press:  10 February 2011

B. P. Bewlay ,
P. W. Whiting ,
A. W. Davis  and
C. L. Briant
B. P. Bewlay
Affiliation:
GE Corporate Research and Development, Schenectady, NY 12301, USA.
P. W. Whiting
Affiliation:
Division of Engineering, Brown University, Providence, RI 02912, USA.
A. W. Davis
Affiliation:
Division of Engineering, Brown University, Providence, RI 02912, USA.
C. L. Briant
Affiliation:
Division of Engineering, Brown University, Providence, RI 02912, USA.
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Abstract

This paper will discuss the relationship between microstructure and creep behavior in hightemperature niobium-silicide based in-situ composites. The creep behavior of composites generated from binary Nb-Si alloys, and higher order alloys containing Mo, Hf and Ti additions, will be described. In-situ composites were tested in compression at temperatures up to 1200°C and stress levels in the range 70 to 280MPa. It was found that the Hf concentration can be increased to 7.5 with little increase in creep rate, over that for the binary Nb3Si-Nb composite, but at higher concentrations the creep rate is increased at stress levels higher than 21OMPa. At stresses less than 21OMPa the Ti concentration can be increased to 21 without a detrimental effect on creep performance, but at higher concentrations there is a substantial increase in the creep rate.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 552: Symposium KK – High-Temperature Ordered Intermetallic Alloys VIII , 1998 , KK6.11.1
Copyright
Copyright © Materials Research Society 1999

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References

REFERENCES

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