Irradiation-induced segregation at dislocation loops in CoCrFeMnNi high entropy alloy

Wei Ying Chen; Jonathan D. Poplawsky; Yiren Chen; Wei Guo; Jien Wei Yeh

doi:10.1016/j.mtla.2020.100951

Irradiation-induced segregation at dislocation loops in CoCrFeMnNi high entropy alloy

Wei Ying Chen, Jonathan D. Poplawsky, Yiren Chen, Wei Guo, Jien Wei Yeh

Materials MicroAnalysis

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Abstract

To understand the redistribution of alloying elements in high entropy alloys under irradiation, a CoCrFeMnNi alloy was irradiated with 1 MeV Kr ions at room temperature and at 500°C, and characterized with atom probe tomography and transmission electron microscopy. At 500°C, Co and Ni were enriched around the interstitial, faulted and perfect, dislocation loops resulted from the ion irradiation. In contrast, no segregation was observed at room temperature. The inverse Kirkendall effect through vacancy flux, as opposed to the interstitial binding mechanism, was the primary underlying process attributing to the observed segregation. In addition, a ring-shaped segregation pattern was observed at the faulted dislocation loops, indicating a non-equilibrium nature of the defect clustering and solute segregation process in CoCrFeMnNi under irradiation at high temperature.

Original language	English
Article number	100951
Journal	Materialia
Volume	14
DOIs	https://doi.org/10.1016/j.mtla.2020.100951
State	Published - Dec 2020

Funding

This work was supported by Laboratory Directed Research and Development funding from Argonne National Laboratory , provided by the Director, Office of Science, of the U.S. Department of Energy (DOE) under Contract No. DE-AC02-06CH11357 , and by the “High Entropy Materials Center” from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and from the Project MOST 109-2634-F-007-024 - by Ministry of Science and Technology (MOST) in Taiwan. APT was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS) in Oak Ridge National Laboratory under Contract No. DE-AC05-00OR22725 with the U.S. DOE. The irradiation and TEM experiment were performed at the Intermediate-Voltage Electron Microscope facility in Argonne National Laboratory with funding supported by DOE, Office of Nuclear Energy , under DOE Idaho Operations Office Contract DE-AC07-051D14517 as part of a Nuclear Science User Facilities. The authors would like to thank James Burns from Oak Ridge National Laboratory for performing APT sample preparation and running the APT experiments, Peter Baldo for performing the ion irradiation in Argonne National Laboratory, and Ko-Kai Tseng from National Tsing Hua University for preparing the CoCrFeMnNi alloy. This work was supported by Laboratory Directed Research and Development funding from Argonne National Laboratory, provided by the Director, Office of Science, of the U.S. Department of Energy (DOE) under Contract No. DE-AC02-06CH11357, and by the “High Entropy Materials Center” from The Featured Areas Research Center Program within the framework of the Higher Education Sprout Project by the Ministry of Education (MOE) and from the Project MOST 109-2634-F-007-024 - by Ministry of Science and Technology (MOST) in Taiwan. APT was conducted at ORNL's Center for Nanophase Materials Sciences (CNMS) in Oak Ridge National Laboratory under Contract No. DE-AC05-00OR22725 with the U.S. DOE. The irradiation and TEM experiment were performed at the Intermediate-Voltage Electron Microscope facility in Argonne National Laboratory with funding supported by DOE, Office of Nuclear Energy, under DOE Idaho Operations Office Contract DE-AC07-051D14517 as part of a Nuclear Science User Facilities. The authors would like to thank James Burns from Oak Ridge National Laboratory for performing APT sample preparation and running the APT experiments, Peter Baldo for performing the ion irradiation in Argonne National Laboratory, and Ko-Kai Tseng from National Tsing Hua University for preparing the CoCrFeMnNi alloy.

Funders	Funder number
U.S. Department of Energy	DE-AC02-06CH11357
Office of Science
Office of Nuclear Energy	DE-AC07-051D14517
Argonne National Laboratory
Oak Ridge National Laboratory	DE-AC05-00OR22725
Laboratory Directed Research and Development
Ministry of Education	109-2634-F-007-024
Ministry of Science and Technology, Taiwan
National Tsing Hua University

Keywords

Atom probe tomography
CoCrFeMnNi
Inverse Kirkendall Effect
Irradiation
Irradiation-Induced Segregation
Transmission electron microscopy
high entropy alloys

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10.1016/j.mtla.2020.100951

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@article{810d140183ce4687add01959bd84022e,

title = "Irradiation-induced segregation at dislocation loops in CoCrFeMnNi high entropy alloy",

abstract = "To understand the redistribution of alloying elements in high entropy alloys under irradiation, a CoCrFeMnNi alloy was irradiated with 1 MeV Kr ions at room temperature and at 500°C, and characterized with atom probe tomography and transmission electron microscopy. At 500°C, Co and Ni were enriched around the interstitial, faulted and perfect, dislocation loops resulted from the ion irradiation. In contrast, no segregation was observed at room temperature. The inverse Kirkendall effect through vacancy flux, as opposed to the interstitial binding mechanism, was the primary underlying process attributing to the observed segregation. In addition, a ring-shaped segregation pattern was observed at the faulted dislocation loops, indicating a non-equilibrium nature of the defect clustering and solute segregation process in CoCrFeMnNi under irradiation at high temperature.",

keywords = "Atom probe tomography, CoCrFeMnNi, Inverse Kirkendall Effect, Irradiation, Irradiation-Induced Segregation, Transmission electron microscopy, high entropy alloys",

author = "Chen, {Wei Ying} and Poplawsky, {Jonathan D.} and Yiren Chen and Wei Guo and Yeh, {Jien Wei}",

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language = "English",

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journal = "Materialia",

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T1 - Irradiation-induced segregation at dislocation loops in CoCrFeMnNi high entropy alloy

AU - Chen, Wei Ying

AU - Poplawsky, Jonathan D.

AU - Chen, Yiren

AU - Guo, Wei

AU - Yeh, Jien Wei

PY - 2020/12

Y1 - 2020/12

N2 - To understand the redistribution of alloying elements in high entropy alloys under irradiation, a CoCrFeMnNi alloy was irradiated with 1 MeV Kr ions at room temperature and at 500°C, and characterized with atom probe tomography and transmission electron microscopy. At 500°C, Co and Ni were enriched around the interstitial, faulted and perfect, dislocation loops resulted from the ion irradiation. In contrast, no segregation was observed at room temperature. The inverse Kirkendall effect through vacancy flux, as opposed to the interstitial binding mechanism, was the primary underlying process attributing to the observed segregation. In addition, a ring-shaped segregation pattern was observed at the faulted dislocation loops, indicating a non-equilibrium nature of the defect clustering and solute segregation process in CoCrFeMnNi under irradiation at high temperature.

AB - To understand the redistribution of alloying elements in high entropy alloys under irradiation, a CoCrFeMnNi alloy was irradiated with 1 MeV Kr ions at room temperature and at 500°C, and characterized with atom probe tomography and transmission electron microscopy. At 500°C, Co and Ni were enriched around the interstitial, faulted and perfect, dislocation loops resulted from the ion irradiation. In contrast, no segregation was observed at room temperature. The inverse Kirkendall effect through vacancy flux, as opposed to the interstitial binding mechanism, was the primary underlying process attributing to the observed segregation. In addition, a ring-shaped segregation pattern was observed at the faulted dislocation loops, indicating a non-equilibrium nature of the defect clustering and solute segregation process in CoCrFeMnNi under irradiation at high temperature.

KW - Atom probe tomography

KW - CoCrFeMnNi

KW - Inverse Kirkendall Effect

KW - Irradiation

KW - Irradiation-Induced Segregation

KW - Transmission electron microscopy

KW - high entropy alloys

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DO - 10.1016/j.mtla.2020.100951

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VL - 14

JO - Materialia

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Irradiation-induced segregation at dislocation loops in CoCrFeMnNi high entropy alloy

Abstract

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Keywords

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