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Atom Probe Field Ion Microscopy of Titanium Aluminides

Published online by Cambridge University Press:  02 July 2020

D. J. Larson  and
M. K. Miller
M. K. Miller
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN, 37831-6376, USA
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Extract

Titanium aluminides have a number of potential high temperature applications due to their good elevated-temperature mechanical properties, low density, and good creep and oxidation resistance. However, fabrication of commercial components of these materials has been impeded by their poor mechanical properties at ambient temperatures. Significant efforts with various degrees of success have been made to improve the mechanical properties of these TiAl alloys by doping them with a variety of different elements including B, C, Cr, Er, Fe, Mn, Mo, Ni, Nb, P, Si, Ta, V and W. One of the optimum analytical tools for investigating the effects of these additions on the microstructure is the atom probe field ion microscope. However, relatively few studies of titanium aluminides, compared to some other intermetallic compounds, have performed by atom probe field ion microscopy. This lack of attention can be attributed to the brittle nature of the material, in-situ transformations that occur during the field ion microscopy and preferential evaporation problems that were encountered in some of the early studies.

Type
Imaging and Analysis at the Atomic Level: 30 Years of Atom Probe Field Ion Microscopy
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. 100 - 101
Copyright
Copyright © Microscopy Society of America

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References

1. Huang, S. C., Structural Intermetallics, ed. Darolia, R., et al., TMS, Warrendale, PA, 1993, p. 299.Google Scholar

2. Miller, M. K. et al., Atom Probe Field Ion Microscopy, Oxford, Oxford University Press (1996).Google Scholar

3. This research was sponsored by the Division of Materials Sciences, U.S. Department of Energy, under contract DE-AC05-960R22464 with Lockheed Martin Energy Research Corp., through the SHaRE Program under contract DE-AC05-760R00033 with Oak Ridge Associated Universities, and by an appointment (DJL) to the ORNL Postdoctoral Research Associates Program administered jointly by the Oak Ridge Institute for Science and Education and ORNL. This research was conducted utilizing the Shared Research Equipment (SHaRE) User Program facilities at ORNL.Google Scholar