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Creep Deformation of Dispersion Strengthened NiAl and TiAl Intermetallics

Published online by Cambridge University Press:  26 February 2011

K. Sadananda ,
H. Jones ,
C.R. Feng  and
A.K. Vasudevan
K. Sadananda
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington D.C. 20375
H. Jones
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington D.C. 20375
C.R. Feng
Affiliation:
Materials Science and Technology Division, Naval Research Laboratory, Washington D.C. 20375
A.K. Vasudevan
Affiliation:
Office of Naval Research, Arlington, VA 22217.
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Abstract

In this study, the creep properties of two intermetallics; NiAl and TiAl have been evaluated. The former was selected based on its relatively high melting point, and the latter was based on its specific strength and high melting point. Tensile creep deformation rates in range of 760 to 930°C were determined as a function of stress for both monolithic NiAl, NiAl reinforced with HfC dispersoids and TiAl reinforced with TiB2 dispersoid. Microstructure and dislocation structures were examined both beore and after creep in both alloys to identify the creep mechanisms. In both systems, deformation occurs by power-law creep with diffusion controlling creep rate. Power-law breakdown regimes have been identified for both systems. In addition, TiAl undergoes dynamic recrystallization during creep resulting in smaller grain sizes than the initial value.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 213: Symposium Q – High-Temperature Ordered Intermetallic Alloys IV , 1990 , 1019
Copyright
Copyright © Materials Research Society 1991

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References

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