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Microstructures and Mechanical Properties of NiAl-Mo Composites

Published online by Cambridge University Press:  26 February 2011

H. Bei  and
E. P. George
H. Bei
Affiliation:
The University of Tennessee, Department of Materials Science and Engineering, Knoxville, TN 37996 Oak Ridge National Laboratory, Metals and Ceramics Division, Oak Ridge, TN 37831
E. P. George
Affiliation:
The University of Tennessee, Department of Materials Science and Engineering, Knoxville, TN 37996 Oak Ridge National Laboratory, Metals and Ceramics Division, Oak Ridge, TN 37831
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Abstract

In-situ composites consisting of ∼14 vol.% continuous Mo fibers embedded in a NiAl matrix were produced by directional solidification in a xenon-arc-lamp, floating-zone furnace. The fiber spacing and size were controlled in the range 1–2 μm and 400–800 nm, respectively, by varying the growth rate between 80 and 20 mm/h. Electron back-scatter diffraction patterns from the constituent phases revealed that the growth directions and interface boundaries exhibited the following orientation relationships: 〈l00〉NiAl//〈100〉Mo and {011}NiAl//{011}Mo. The temperature dependence of the tensile strength and ductility were investigated and the NiAl-Mo composite was found to be both stronger and have a lower ductile-brittle transition temperature than the unreinforced NiAl matrix.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 842: Symposium S – Integrative and Interdisciplinary Aspects of Intermetallics , 2004 , S1.2
Copyright
Copyright © Materials Research Society 2005

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References

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