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Self-diffusion in carbon-alloyed CoCrFeMnNi high entropy alloys

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Rao,  Ziyuan
De magnete - Designing Magnetism on the atomic scale, MPG Group, Interdepartmental and Partner Groups, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
High-Entropy Alloys, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;

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Li,  Zhiming
High-Entropy Alloys, Project Groups, Microstructure Physics and Alloy Design, Max-Planck-Institut für Eisenforschung GmbH, Max Planck Society;
School of Materials Science and Engineering, Central South University, Changsha 410083, China;

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Citation

Lukianova, O. A., Kulitskiy, V. A., Rao, Z., Li, Z., Wilde, G., & Divinski, S. V. (2022). Self-diffusion in carbon-alloyed CoCrFeMnNi high entropy alloys. Acta Materialia, 237: 118136. doi:10.1016/j.actamat.2022.118136.


Cite as: https://hdl.handle.net/21.11116/0000-000A-E960-3
Abstract
Tracer diffusion of the substitutional components in interstitial (CoCrFeNiMn)1-xCx high-entropy alloys with nominally x = 0.002, 0.005 and 0.008 (in at. fractions) is measured at elevated temperatures from 1173 to 1373 K. Two different characteristic effects of interstitial carbon addition on substitutional diffusion in these FCC alloys are distinguished. At the highest temperature of 1373 K, alloying by C with relatively low concentrations (x = 0.002) retards diffusion of the substitutional elements with respect to those in the C-free alloy. At lower temperatures and/or higher C concentrations (x ≥ 0.005), an enhancement of the diffusion rates of all substitutional elements is seen. A model is suggested that relates the self-diffusivities in the CoCrFeMnNi-C alloys with the lattice distortion imposed by interstitially dissolved carbon. The experimental results are interpreted in terms of a decrease of the migration barriers for vacancy-mediated diffusion due to the presence of interstitial C atoms.