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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

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