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The Microstructure of Oxidized Consolidated Nanocrystalline NiAl

Published online by Cambridge University Press:  02 July 2020

T. Chen  and
J.M. Hampikian
T. Chen
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245
J.M. Hampikian
Affiliation:
School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA, 30332-0245
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Extract

The intermetallic, stoichiometric compound NiAl is a candidate for aggressive environments such as those encountered in aircraft engines due to its excellent oxidation resistance and high melting point. However, NiAl is limited in application by its insufficient ambient temperature ductility. This may potentially be overcome via synthesis of NiAl with a nanocrystalline microstructure. Since microstructure can also affect oxidation resistance [1], the focus of this investigation is to examine the oxidation characteristics of nanocrystalline NiAl.

Nanophased NiAl specimens were prepared by mechanical alloying followed by shock wave consolidation, which yielded consolidated material with an average grain size of 11 ±8 nm [2]. Thermogravimetric analysis (TGA) of nanosized NiAl was used to characterize the material's oxidation resistance, and performed for three different times (0.5 h, 5 h, 48 h) in compressed air at 1373 K. It was found that the thickness of the scale increased with increasing oxidation time, in accordance with parabolic oxidation kinetics.

Type
Metals and Alloys
Information
Microscopy and Microanalysis , Volume 4 , Issue S2: Proceedings: Microscopy & Microanalysis '98, Microscopy Society of America 56th Annual Meeting, Microbeam Analysis Society 32nd Annual Meeting, Atlanta, Georgia July 12-16, 1998 , July 1998 , pp. 544 - 545
Copyright
Copyright © Microscopy Society of America

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References

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7. This work is supported by the National Science Foundation under Grant No. DMR-9624927. acknowledge the assistance of Prof. Thadhani concerning the shock wave consolidation.Google Scholar