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Effect of Atomic Order on Iron and Cobalt Grain Boundary Diffusion in the FeCo Equiatomic Compound

Published online by Cambridge University Press:  10 February 2011

Zs. Tôkei ,
J. Bernardini  and
D. L. Beke
Zs. Tôkei
Affiliation:
Laboratoire de Métallurgie, UMR 6518, Faculté des Sciences Saint Jérôme, 13397 Marseille cedex 20, France. Department of Solid State Physics, L. Kossuth University, P. O. Box 2, 4010 Debrecen, Hungary.
J. Bernardini
Affiliation:
Laboratoire de Métallurgie, UMR 6518, Faculté des Sciences Saint Jérôme, 13397 Marseille cedex 20, France.
D. L. Beke
Affiliation:
Department of Solid State Physics, L. Kossuth University, P. O. Box 2, 4010 Debrecen, Hungary.
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Abstract

Simultaneous grain boundary self-diffusion of iron and cobalt in FeCo was investigated in the B-kinetic regime by the radiotracer method combined with a serial sectioning technique over the temperature range 873-1133 K, which includes the A2-B2 bulk order-disorder transition temperature. This transition leads to a decrease in both iron and cobalt mass transport mainly owing to a change in the pre-exponential factor, but not in the diffusion activation energy. Moreover, the breaking point in the Arrhenius plots is observed below the bulk order-disorder transition temperature. In view of recent surface segregation studies on Fe-Co, and according to the Fe-Co phase diagram, the results are discussed assuming an iron segregation, which decreases the A2-B2 transition temperature in grain boundaries.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 527: Symposium Z – Diffusion Mechanisms in Crystalline Materials , 1998 , 267
Copyright
Copyright © Materials Research Society 1998

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