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Atom Probe Tomography Of Interfaces

Published online by Cambridge University Press:  02 July 2020

M. K. Miller
M. K. Miller*
Affiliation:
Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, TN37831-6376, USA
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Extract

The technique of atom probe tomography (APT) enables the x, y, and z coordinates and the elemental identities of the atoms in a small volume to be determined at the atomic level. Therefore, the APT technique may be used to characterize solute segregation to interfaces and precipitation in terms of concentration gradients and precipitate morphology. This type of information may be used to optimize the design of alloys.

The material that was used to illustrate the capabilities of atom probe tomography is a complex polycrystalline nickel-based superalloy, Alloy 718. The composition of this commercial superalloy is Ni- 3.2 at. % Nb, 0.96% Al, 1.15% Ti, 20.3% Fe, 21.8% Cr, 0.26% Co, 1.8% Mo, 0.16% Mn, 0.21% Si and 0.26% C. The material was characterized after a heat treatment oM h at 1038°C + 8 h at 870°C + 500 h at 600°C. Previous atom probe field ion microscopy characterizations of this material has demonstrated that there is no intragranular precipitation after the anneal at 1038°C.

Type
Atomic Structure And Microchemistry Of Interfaces
Information
Microscopy and Microanalysis , Volume 5 , Issue S2: Proceedings: Microscopy & Microanalysis '99, Microscopy Society of America 57th Annual Meeting, Microbeam Analysis Society 33rd Annual Meeting, Portland, Oregon August 1-5, 1999 , August 1999 , pp. 118 - 119
Copyright
Copyright © Microscopy Society of America

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References

1. Miller, M.K. and Burke, M.G., Proc. “Alloy Phase Stability and Design”, April 1990, San Francisco, CA, 186, eds. Stocks, G. M., Pope, S. P. and Giamei, A. F., pub. Materials Research Society, Pittsburgh, PA, 1991, pp. 223-228.Google Scholar

2. Burke, M.G. and Miller, M.K., ibid, 215–218.Google Scholar

3. This research was sponsored by the Division of Materials Sciences, U.S. Department of Energy under contract DE-AC05-96OR22464 with Lockheed Martin Energy Research Corp. and through the SHaRE Program under contract DE-AC05-76OR00033 with Oak Ridge Associated Universities. This research was conducted utilizing the Shared Research Equipment (SHaRE) User Program facilities at Oak Ridge National Laboratory.Google Scholar