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Creep Studies of Monolithic Phases in Nb-Silicide Based In-Situ Composites

Published online by Cambridge University Press:  21 March 2011

B.P. Bewlay ,
C.L. Briant ,
E.T. Sylven ,
M.R. Jackson  and
G. Xiao
B.P. Bewlay
Affiliation:
GE Corporate Research and Development, Schenectady, NY 12301, USA
C.L. Briant
Affiliation:
Division of Engineering, Brown University, Providence, RI 02912, USA
E.T. Sylven
Affiliation:
Division of Engineering, Brown University, Providence, RI 02912, USA
M.R. Jackson
Affiliation:
GE Corporate Research and Development, Schenectady, NY 12301, USA
G. Xiao
Affiliation:
Division of Engineering, Brown University, Providence, RI 02912, USA
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Abstract

Nb-silicide composites combine a ductile Nb-based solid solution with high-strength silicides, and they show great promise for aircraft engine applications. Previous work has shown that the silicide composition has an important effect on the creep rate. If the Nb:(Hf+Ti) ratio is reduced below ∼1.5, the creep rate increases significantly. This observation could be related to the type of silicide present in the material. To understand the effect of each phase on the composite creep resistance, the creep rates of selected monolithic phases were determined. To pursue this goal, monolithic alloys with compositions similar to the Nb-based solid solution and to the silicide phases, Laves, and T2 phases, were prepared. The creep rates were measured under compression at 1100 and 1200°C. The stress sensitivities of the creep rates of the monolithic phases were also determined. These results allow quantification of the load bearing capability of the individual phases in the Nb-silicide based in-situ composites.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 646 , 2000 , N2.6.1
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

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