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Mo Fiber Reinforced NiAl Composites Produced by Directional Solidification – Process, Microstructure and Mechanical Properties

Published online by Cambridge University Press:  19 January 2011

L. Hu ,
S. Bogner ,
W. Hu ,
A. Bührig-Polaczek  and
G. Gottstein
L. Hu
Affiliation:
Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, 52056 Aachen, Germany
S. Bogner
Affiliation:
Foundry Institute, RWTH Aachen University, 52056 Aachen, Germany
W. Hu
Affiliation:
Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, 52056 Aachen, Germany
A. Bührig-Polaczek
Affiliation:
Foundry Institute, RWTH Aachen University, 52056 Aachen, Germany
G. Gottstein
Affiliation:
Institute of Physical Metallurgy and Metal Physics, RWTH Aachen University, 52056 Aachen, Germany
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Abstract

Composites with a eutectic composition NiAl-9at.%Mo were produced by controlled directional solidification (DS) so that refractory metallic Mo fibers were precipitated and aligned in the NiAl matrix parallel to the solidification direction through the eutectic reaction. Such NiAl composites can be used for structural applications at high temperatures (> 1000 °C), for example as blade material for modern gas turbines. The microstructure of the composites was examined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The interface fine structure between Mo fiber and NiAl matrix was studied by high resolution TEM (HRTEM). Mechanical properties were measured by tensile tests at 700 °C and 1100 °C. Accordingly, a correlation of the DS parameters, microstructure and mechanical properties was established.

Keywords

compositedirectional solidificationstrength
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1295: Symposium N – Intermetallic-Based Alloys for Structural and Functional Applications , 2011 , mrsf10-1295-n08-09
Copyright
Copyright © Materials Research Society 2011

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References

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