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Vacancy-carbon complexes in bcc iron: Correlation between carbon content, vacancy concentration and diffusion coefficient

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Kirchheim,  Reiner
Institut für Materialphysik, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, D-37077 Göttingen, Germany;
International Institute for Carbon-Neutral Energy Research (WPI-I2 CNER), Kyushu University, Japan;
Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Citation

Kresse, T., Borchers, C., & Kirchheim, R. (2013). Vacancy-carbon complexes in bcc iron: Correlation between carbon content, vacancy concentration and diffusion coefficient. Scripta Materialia, 69(9), 690-693. doi:10.1016/j.scriptamat.2013.08.001.


Cite as: https://hdl.handle.net/21.11116/0000-0001-D712-8
Abstract
Self-diffusion in face-centered cubic (fcc) iron and hexagonal close-packed cobalt as well as Ni diffusion in bcc iron and Co-diffusion in fcc nickel are all accelerated in the presence of dissolved carbon. This is attributed to an enlarged vacancy concentration due to an attractive vacancy-carbon interaction. The enlarged Ni diffusion in body-centered cubic (bcc) iron contradicts conclusions for self-diffusion in bcc iron obtained from first-principles calculations. This discrepancy is discussed in the present study. © 2013 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.