Dynamic substrate reactions during room temperature heavy ion irradiation of CoCrCuFeNi high entropy alloy thin films

Timothy G. Lach; Chinthaka M. Silva; Yufan Zhou; Walker L. Boldman; Philip D. Rack; William J. Weber; Yanwen Zhang

doi:10.1038/s41529-022-00260-2

Dynamic substrate reactions during room temperature heavy ion irradiation of CoCrCuFeNi high entropy alloy thin films

Timothy G. Lach, Chinthaka M. Silva, Yufan Zhou, Walker L. Boldman, Philip D. Rack, William J. Weber, Yanwen Zhang

Nuclear Energy Materials Microanalysis

Research output: Contribution to journal › Article › peer-review

8 Scopus citations

Abstract

High entropy alloys (HEAs) are promising materials for various applications including nuclear reactor environments. Thus, understanding their behavior under irradiation and exposure to different environments is important. Here, two sets of near-equiatomic CoCrCuFeNi thin films grown on either SiO₂/Si or Si substrates were irradiated at room temperature with 11.5 MeV Au ions, providing similar behavior to exposure to inert versus corrosion environments. The film grown on SiO₂ had relatively minimal change up to peak damage levels above 500 dpa, while the film grown on Si began intermixing at the substrate–film interface at peak doses of 0.1 dpa before transforming into a multi-silicide film at higher doses, all at room temperature with minimal thermal diffusion. The primary mechanism is radiation-enhanced diffusion via the inverse Kirkendall and solute drag effects. The results highlight how composition and environmental exposure affect the stability of HEAs under radiation and give insights into controlling these behaviors.

Original language	English
Article number	60
Journal	npj Materials Degradation
Volume	6
Issue number	1
DOIs	https://doi.org/10.1038/s41529-022-00260-2
State	Published - Dec 2022

Funding

This work was supported as part of Energy Dissipation to Defect Evolution (EDDE), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under contract number DE-AC05-00OR22725. This work was also supported in part by Fusion Materials program through the U.S. Department of Energy, Office of Science, Fusion Energy Sciences. The ion irradiations were performed at the Ion Beam Materials Laboratory located at the University of Tennessee, Knoxville. P.D.R. acknowledges support from the Center for Nanophase Materials Sciences from the U.S. Department of Energy (DOE) under grant No# KC0403040 ERKCZ01. This work was also partly performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory (LLNL) under Contract No. DE-AC52-07NA27344. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US Government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). This work was supported as part of Energy Dissipation to Defect Evolution (EDDE), an Energy Frontier Research Center funded by the U.S. Department of Energy, Office of Science, Basic Energy Sciences, under contract number DE-AC05-00OR22725. This work was also supported in part by Fusion Materials program through the U.S. Department of Energy, Office of Science, Fusion Energy Sciences. The ion irradiations were performed at the Ion Beam Materials Laboratory located at the University of Tennessee, Knoxville. P.D.R. acknowledges support from the Center for Nanophase Materials Sciences from the U.S. Department of Energy (DOE) under grant No# KC0403040 ERKCZ01. This work was also partly performed under the auspices of the U.S. Department of Energy by Lawrence Livermore National Laboratory (LLNL) under Contract No. DE-AC52-07NA27344. This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the US Department of Energy (DOE). The US government retains and the publisher, by accepting the article for publication, acknowledges that the US government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so, for US Government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan (http://energy.gov/downloads/doe-public-access-plan).

Funders	Funder number
Center for Nanophase Materials Sciences
DOE Public Access Plan
U.S. Department of Energy	KC0403040 ERKCZ01
Office of Science
Basic Energy Sciences	DE-AC05-00OR22725
Fusion Energy Sciences
Lawrence Livermore National Laboratory	DE-AC52-07NA27344
University of Tennessee

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title = "Dynamic substrate reactions during room temperature heavy ion irradiation of CoCrCuFeNi high entropy alloy thin films",

abstract = "High entropy alloys (HEAs) are promising materials for various applications including nuclear reactor environments. Thus, understanding their behavior under irradiation and exposure to different environments is important. Here, two sets of near-equiatomic CoCrCuFeNi thin films grown on either SiO2/Si or Si substrates were irradiated at room temperature with 11.5 MeV Au ions, providing similar behavior to exposure to inert versus corrosion environments. The film grown on SiO2 had relatively minimal change up to peak damage levels above 500 dpa, while the film grown on Si began intermixing at the substrate–film interface at peak doses of 0.1 dpa before transforming into a multi-silicide film at higher doses, all at room temperature with minimal thermal diffusion. The primary mechanism is radiation-enhanced diffusion via the inverse Kirkendall and solute drag effects. The results highlight how composition and environmental exposure affect the stability of HEAs under radiation and give insights into controlling these behaviors.",

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AU - Lach, Timothy G.

AU - Silva, Chinthaka M.

AU - Zhou, Yufan

AU - Boldman, Walker L.

AU - Rack, Philip D.

AU - Weber, William J.

AU - Zhang, Yanwen

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AB - High entropy alloys (HEAs) are promising materials for various applications including nuclear reactor environments. Thus, understanding their behavior under irradiation and exposure to different environments is important. Here, two sets of near-equiatomic CoCrCuFeNi thin films grown on either SiO2/Si or Si substrates were irradiated at room temperature with 11.5 MeV Au ions, providing similar behavior to exposure to inert versus corrosion environments. The film grown on SiO2 had relatively minimal change up to peak damage levels above 500 dpa, while the film grown on Si began intermixing at the substrate–film interface at peak doses of 0.1 dpa before transforming into a multi-silicide film at higher doses, all at room temperature with minimal thermal diffusion. The primary mechanism is radiation-enhanced diffusion via the inverse Kirkendall and solute drag effects. The results highlight how composition and environmental exposure affect the stability of HEAs under radiation and give insights into controlling these behaviors.

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Dynamic substrate reactions during room temperature heavy ion irradiation of CoCrCuFeNi high entropy alloy thin films

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