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Nanometer Scale Study of Segregation at Heterophase Interfaces of Molybdenum Nitride Precipitates in an α-Iron Matrix

Published online by Cambridge University Press:  21 March 2011

Dieter Isheim ,
Roseann Csencsits  and
David N. Seidman
Dieter Isheim
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, 2225 N. Campus Drive, IL 60208-3108, U.S.A.
Roseann Csencsits
Affiliation:
Materials Science Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, IL 60439, U.S.A.
David N. Seidman
Affiliation:
Department of Materials Science and Engineering, Northwestern University, Evanston, 2225 N. Campus Drive, IL 60208-3108, U.S.A.
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Abstract

We are studying heterophase interfaces between molybdenum nitride precipitates and an α-iron matrix on a nanometer scale by electron and atom-probe field-ion microscopies. Fe-2 at.% Mo-0.5 at.% Sn and Fe-2 at.% Mo-0.4 at.% Sb are internally nitrided by annealing in an NH3/2 atmosphere. Nitridation at 550°C produces coherent thin platelet-shaped molybdenum nitride precipitates, while at 600°C semicoherent coarse plates and spheres also form. Segrega-tion of Sn and Sb is observed at the heterophase interfaces of only the semicoherent precipitates. The loss of coherency, that is the formation of misfit dislocations, is essential for substantial interfacial solute segregation to occur at heterophase interfaces.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 652: Symposium Y – Influences of Interface & Dislocation Behavior on Microstructure Evolution , 2000 , Y10.2
Copyright
Copyright © Materials Research Society 2001

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References

REFERENCES

1. Krakauer, B.W. and Seidman, D.N., Acta mater. 46, 6145 (1998).Google Scholar
2. Hellman, O.C. and Seidman, D.N., Mater. Sci. Forum 294–296, 419 (1999).Google Scholar
3. Rittner, J.D. and Seidman, D.N., Acta mater. 45, 3191 (1997).Google Scholar
4. Wagner, R. and Brenner, S.S., Acta metall. 26, 197 (1978).Google Scholar
5. Brenner, S.S. and Goodman, S.R., Scripta metall. 5, 865 (1971).Google Scholar
6. Jack, K.H., in High Nitrogen Steels (HNS 88), Proc. Intl. Conf., Lille, France 1988, edited by Foct, J. and Hendry, A. (The Institue of Metals, 1989) pp. 117–135.Google Scholar
7. Brenner, S.S. and Walck, S.D., in Proceedings, 27th IFES, eds. Yashiro, Y. & Igata, N., Tokyo (1980) pp. 328–333.Google Scholar
8. Evans, D.A. and Jack, K.H., Acta cryst. 10, 833 (1957).Google Scholar
9. Troitskaya, N.V. and Pinsker, Z.G., Soviet Phys. Crystallogr. 6, 33, (1961).Google Scholar
10. Baker, R.G., Nutting, J., Precipitation processes in steels, The Iron and Steel Institute, Special Report No. 64 (The Iron and Steel Institute, London, 1959) pp. 1–22.Google Scholar
11. Mehrer, H. (Ed), Diffusion in Solid Metals and Alloys, Landolt-Börnstein Vol III/26. Springer-Verlag, Berlin, 1990).Google Scholar
12. Torres, D.N., Perez, R.A. and Dyment, F., Acta mater. 48, 2925 (2000).Google Scholar
13. King, H.W., J. Mat. Sci. 1, 79 (1966).Google Scholar