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Microstructure and 1000–1400 K mechanical properties of cryomilled NiAl–0.7Zr

Published online by Cambridge University Press:  31 January 2011

J. D. Whittenberger ,
A. Garg  and
Mohan G. Hebsur
J. D. Whittenberger*
Affiliation:
NASA-Glenn Research Center at Lewis Field, Cleveland, OH 44135
A. Garg
Affiliation:
AYT Corp. at NASA-Glenn Research Center at Lewis Field, Cleveland, OH 44135
Mohan G. Hebsur
Affiliation:
OAI/NASA, GRC Group, Brookpark, OH 44142
*
a)e-mail: [email protected]
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Abstract

An attempt has been made to improve the intermediate temperature strength of cryomilled NiAl by utilizing third element solid solution or precipitation strengthening mechanisms. To this end an NiAl–0.7 (at.%) Zr alloy was cryomilled, densified by hot extrusion, and tested between 1000 and 1400 K. Although over 3 wt% nitrogen was introduced via cryomilling, mechanical testing revealed that the cryomilled NiAl–0.7Zr was significantly weaker than the base alloy between 1000 and 1200 K. Chemical and microstructural analyses revealed that, in addition to ∼ 16 vol% AlN, all the Zr had been converted into ZrN. A thermodynamic analysis of cryomilling indicated that the formation of ZrN could have been anticipated since it is a more stable nitride than AlN. While Zr was an unsatisfactory addition in NiAl, thermodynamics also suggest several alloying elements that might lead to good intermediate temperature strength after cryomilling.

Type
Articles
Information
Journal of Materials Research , Volume 14 , Issue 6 , June 1999 , pp. 2418 - 2429
Copyright
Copyright © Materials Research Society 1999

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References

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