Grain boundary self-diffusion in Fe films with a stable nanostructure

Grain boundary self-diffusion in Fe films with a stable nanostructure

Grain boundary self-diffusion in Type-C regime was investigated in nano-crystalline bcc iron at low temperatures between 100 and 250 °C using neutron reflectometry in combination with [ nat Fe(7 nm)/ 57 Fe(3 nm)] 10 isotope multilayers. The method allows to determine diffusivities in a stable nanost...

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Veröffentlicht in:Journal of materials science 2012-05, Vol.47 (9), p.4087-4092
Hauptverfasser: Schmidt, H., Chakravarty, S., Jiang, M., Hüger, E., Parida, P. K., Geue, T., Stahn, J., Tietze, U., Lott, D.
Format: Artikel
Sprache:eng
Schlagworte:
Activation
Characterization and Evaluation of Materials
Chemistry and Materials Science
Classical Mechanics
Crystallography and Scattering Methods
Diffusion
Enthalpy
Grain boundaries
Grain growth
Iron
Iron 57
Isotopes
Materials Science
Multilayers
Nanocrystals
Nanostructure
Polymer Sciences
Reflectometry
Self diffusion
Solid Mechanics
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Zusammenfassung:Grain boundary self-diffusion in Type-C regime was investigated in nano-crystalline bcc iron at low temperatures between 100 and 250 °C using neutron reflectometry in combination with [ nat Fe(7 nm)/ 57 Fe(3 nm)] 10 isotope multilayers. The method allows to determine diffusivities in a stable nanostructure without concurrent grain growth. An activation enthalpy of diffusion of (0.9 ± 0.3) eV is found, comparable to the value of coarse-grained Fe.
ISSN:0022-2461
1573-4803
DOI:10.1007/s10853-012-6262-0