Abstract
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 [natFe(7 nm)/57Fe(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.
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Acknowledgements
The authors thank A. Gupta, Indore, India, for the possibility to use his ion-beam sputtering setup for sample preparation and L. Dörrer, TU Clausthal, for the SIMS analysis. This study is based on experiments performed at the Geesthacht neutron facility, GeNF, Germany and at the Swiss spallation neutron source SINQ, Paul Scherrer Institute, Villigen, Switzerland. This research has been supported by the German Research Foundation under the contract Schm1569/10-2 and by the European Commission under the 7th Framework Programme through the ‘Research Infrastructures’ action of the ‘Capacities’ Programme, Contract No. CP-CSA_INFRA-2008-1.1.1 No. 226507-NMI3.
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Schmidt, H., Chakravarty, S., Jiang, M. et al. Grain boundary self-diffusion in Fe films with a stable nanostructure. J Mater Sci 47, 4087–4092 (2012). https://doi.org/10.1007/s10853-012-6262-0
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DOI: https://doi.org/10.1007/s10853-012-6262-0