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The Effects of Substitutional Additions on Creep Behavior of Tetragonal and Hexagonal Nb-Silicides

Published online by Cambridge University Press:  11 February 2011

B. P. Bewlay ,
C. L. Briant ,
E. T. Sylven  and
M. R. Jackson
B. P. Bewlay
Affiliation:
GE Global Research, 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 Global Research, Schenectady. NY 12301, USA.
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Abstract

Nb-silicide based in-situ composites combine a ductile Nb-based solid solution with high-strength silicides, and they show great promise for aircraft engine applications. The Nb-silicide controls the high-temperature creep behavior of the composite. Previous work has shown that the silicide composition has an important effect on the creep rate, with particular attention on the role of Ti and Hf additions. The aim of the present study is to understand the effects of the substitutional elements on the stability of the silicide phase, ordering in the crystal lattice, including the hP16-tI32 transition, and the creep behavior of the monolithic phases. To pursue this goal monolithic alloys with a range of compositions were prepared and the creep rates were measured at temperatures of 1100–1350°C. The stress sensitivities of the creep rates of the monolithic phases were also determined.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 753: Symposium BB – Defect Properties and Related Phenomena in Intermetallic Alloys , 2002 , BB5.24
Copyright
Copyright © Materials Research Society 2003

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References

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