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Analytical TEM Study of Nanophase Precipitation in Nial Alloys

Published online by Cambridge University Press:  02 July 2020

A. W. Wilson ,
J. M. Howe ,
A. Garg  and
R. D. Noebe
A. W. Wilson
Affiliation:
Department of Materials Science & Engineering, University of Virginia, Charlottesville, VA22903-2442
J. M. Howe
Affiliation:
Department of Materials Science & Engineering, University of Virginia, Charlottesville, VA22903-2442
A. Garg
Affiliation:
NASA Lewis Research Center, Cleveland, OH44135
R. D. Noebe
Affiliation:
NASA Lewis Research Center, Cleveland, OH44135
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Extract

Alloying additions have been found to enhance the mechanical properties of NiAl through solid solution strengthening and the precipitation of 2°d phases. The precipitation of fine, homogeneously nucleated ß' (Ni2Al (Ti,Hf)) has been observed and characterized by dark-field imaging and electron diffraction. The exact composition of these and other precipitates, however, remains unknown. In this study, the composition of the fine ( <20 nm) ß’ precipitates in NiAl alloys is measured and compared to that of well-developed ß’ plates in the matrix.

Two directionally solidified NiAl single-crystal alloys, NiAl-3Ti-0.5Hf and NiAl-7Ti (at.%) were grown by a Bridgeman technique using high purity alumina crucibles. Both ingots were homogenized for 32 h at 1644 K. In addition, the NiAl-3Ti-0.5Hf sample was aged at 1255 K for 6 h and furnace cooled. Samples for transmission electron microscopy were prepared from 3 mm diameter cylinders electro-discharge machined from the heat-treated ingots.

Type
Analytical Electron Microscopy
Information
Microscopy and Microanalysis , Volume 3 , Issue S2: Proceedings: Microscopy & Microanalysis '97, Microscopy Society of America 55th Annual Meeting, Microbeam Analysis Society 31st Annual Meeting, Histochemical Society 48th Annual Meeting, Cleveland, Ohio, August 10-14, 1997 , August 1997 , pp. 1007 - 1008
Copyright
Copyright © Microscopy Society of America 1997

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References

1Garg, A.et al., Micromechanics of Advanced Materials (1995) 255.Google Scholar
2Wilson, A. W.et al., Microscopy andMicroanalysis 1996 (1996) 230.Google Scholar
3Garg, A.et al., Microscopy and Microanalysis 1996 (1996) 998.Google Scholar