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Properties of Iron Atoms at Grain Boundaries in Fe and Fe72Al28

Published online by Cambridge University Press:  10 February 2011

O. Schneeweiss ,
I. Turek ,
J. Čermák  and
P. Lejček
O. Schneeweiss
Affiliation:
Institute of Physics of Materials, AS CR, Žižkova 22, CZ-61662 Brno, Czech Republic
I. Turek
Affiliation:
Institute of Physics of Materials, AS CR, Žižkova 22, CZ-61662 Brno, Czech Republic
J. Čermák
Affiliation:
Institute of Physics of Materials, AS CR, Žižkova 22, CZ-61662 Brno, Czech Republic
P. Lejček
Affiliation:
Institute of Physics, AS CR, Na Slovance 2, CZ-18040 Praha, Czech Republic
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Abstract

Location of diffused 57Co atoms in single crystals, bicrystals and polycrystals of pure iron and Fe72Al28alloy were investigated by means of emission Mössbauer spectroscopy. To interpret the results, first principles calculations of iron atom magnetic moments and hyper-fine field were carried out. From comparison of M6ssbauer spectra of single crystals with those of bicrystals and polycrystals, an information about grain boundary positions occupied by diffusing atoms is obtained. It is shown that about 5% of the diffusing atoms at the {112} grain boundary of iron are located at the positions either having impurity atoms in the nearest neighbourhood or characterized by larger atomic spacing in comparison with the bulk. In the Fe72Al28 a dominating portion of diffusing atoms have different surrounding than in grain volume. An enrichment of grain boundaries by aluminum could explain their hyperfine parameters.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 527: Symposium Z – Diffusion Mechanisms in Crystalline Materials , 1998 , 273
Copyright
Copyright © Materials Research Society 1998

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References

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