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Apfim Investigation of Segregation in a Nickel Base Alloy

Published online by Cambridge University Press:  02 July 2020

M. Thuvander  and
K. Stiller
M. Thuvander
Affiliation:
Department of Experimental Physics, Chalmers University of Technology, Goteborg, Sweden
K. Stiller
Affiliation:
Department of Experimental Physics, Chalmers University of Technology, Goteborg, Sweden
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Extract

Segregation of boron, carbon and nitrogen to grain boundaries in a nickel based model alloy has been investigated using atom probe field ion microscopy (APFIM). The material corresponds to a commercial alloy (Inconel 600), but contains lower levels of alloy additives and impurities. The major composition was Ni-16Cr-10Fe (wt.%). The alloy was solution annealed at 950°C for 10 min, which resulted in a grain size of 20 μ. Subsequently heat treatments for 1 h at temperatures of 550°C, 600°C and 700°C were applied. TEM investigation showed that the heat treatment at 700°C resulted in precipitation of intergranular chromium-rich carbides. The other temperatures were obviously too low and the aging times too short to cause precipitation, since carbides were not observed in the materials heat treated at 550°C and 600°C.

As the grain size was about 100 times larger than the accessible depth of APFIM analysis (≃200 nm), much care had to be taken in preparing samples containing a grain boundary close to the tip apex.

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. 118 - 119
Copyright
Copyright © Microscopy Society of America

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References

1.Thuvander, M. and Stiller, K., J. Phys. (Paris), 6-C5 (1996) 247.Google Scholar
2.Krakauer, B. W. and Seidman, D. N., Phys. Rev. B, 48 (1993) 6724.CrossRefGoogle Scholar