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Powder Processing of NiAl for Elevated Temperature Strength

Published online by Cambridge University Press:  15 February 2011

J. Daniel Whittenberger,
Peter Grahle,
Eduard Arzt,
Robert Behr,
Klaus Zöltzer and
Mohan Hebsur
J. Daniel Whittenberger
Affiliation:
NASA-Lewis Research Center, Cleveland, OH, USA
Peter Grahle
Affiliation:
Max-Planck-Institut für Metallforschung, Stuttgart, GERMANY
Eduard Arzt
Affiliation:
Max-Planck-Institut für Metallforschung, Stuttgart, GERMANY
Robert Behr
Affiliation:
Max-Planck-Institut für Metallforschung, Stuttgart, GERMANY
Klaus Zöltzer
Affiliation:
Max-Planck-Institut für Metallforschung, Stuttgart, GERMANY
Mohan Hebsur
Affiliation:
NASA-Lewis Research Center, Cleveland, OH, USA
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Abstract

In an effort to superimpose two different elevated temperature strengthening mechanisms in NiAl, one lot of an oxide dispersion strengthened (ODS) NiAl powder has been milled in liquid nitrogen (cryomilled) to introduce A1N particles at the grain boundaries, and a second lot of ODS powder was simply roasted in gaseous nitrogen as an alternative means to produce AIN reinforced grain boundaries. Powder from both of these lots as well as the starting material have been consolidated by hot extrusion and tested at 1300 K. Both nitrogen roasting and cryomilling produced AIN within the ODS NiAl matrix which strengthened the alloy; however, based on the AIN content, cryomilling is more effective.

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References

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