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Tracer diffusion in single crystalline CoCrFeNi and CoCrFeMnNi high entropy alloys

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Abstract

High entropy alloys are multicomponent alloys, which consist of five or more elements in equiatomic or nearly equiatomic concentrations. These materials are hypothesized to show significantly decreased self-diffusivities. For the first time, diffusion of all constituent elements in equiatomic CoCrFeNi and CoCrFeMnNi single crystals and additionally solute diffusion of Mn in the quaternary alloy is investigated using the radiotracer technique, thereby the tracer diffusion coefficients of 57Co, 51Cr, 59Fe, 54Mn, and 63Ni are determined at a temperature of 1373 K. The components are characterized by significantly different diffusion rates, with Mn being the fastest element and Ni and Co being the slowest ones. Furthermore, solute diffusion of Cu in the CoCrFeNi single crystal is investigated in the temperature range of 973–1173 K using the 64Cu isotope. In the quaternary alloy, Cu is found to be a fast diffuser at the moderate temperatures below 1273 K and its diffusion rate follows the Arrhenius law with an activation enthalpy of about 149 kJ/mol.

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ACKNOWLEDGMENTS

Financial support by the Deutsche Forschungsgemeinschaft (DFG) (research Project No. DI 1419/13-1) is gratefully acknowledged. The usage of implantation equipment supported by the Federal Ministry of Education and Research (BMBF) through Grant Nos. 05K13MG1 and 05K16PGA (ISOLDE Project Nos. IS626 & IS627) is gratefully acknowledged. We would like to express our special thanks to the support by the ISOLDE team (particularly Fabian Hergemöller, Juliana Schell, Karl Johnston, and João Guilherme Correia).

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Authors and Affiliations

  1. Institute of Materials Physics, University of Münster, Münster, 48149, Germany

    Daniel Gaertner, Josua Kottke, Gerhard Wilde & Sergiy V. Divinski

  2. Department of Physics of Metals, Tomsk State University, Tomsk, 634050, Russia

    Yury Chumlyakov

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  1. Daniel Gaertner
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  2. Josua Kottke
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  4. Sergiy V. Divinski
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Correspondence to Daniel Gaertner or Sergiy V. Divinski.

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Gaertner, D., Kottke, J., Wilde, G. et al. Tracer diffusion in single crystalline CoCrFeNi and CoCrFeMnNi high entropy alloys. Journal of Materials Research 33, 3184–3191 (2018). https://doi.org/10.1557/jmr.2018.162

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  • DOI: https://doi.org/10.1557/jmr.2018.162

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