Defect-specific strength factors and superposition model for predicting strengthening of ion irradiated Fe18Cr alloy

Pengcheng Zhu; Yajie Zhao; Yan Ru Lin; Jean Henry; Steven J. Zinkle

doi:10.1016/j.jnucmat.2023.154823

Defect-specific strength factors and superposition model for predicting strengthening of ion irradiated Fe18Cr alloy

Pengcheng Zhu, Yajie Zhao, Yan Ru Lin, Jean Henry, Steven J. Zinkle

Radiation Effects and Microstructural An

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

8 Scopus citations

Abstract

A high-purity binary alloy Fe18Cr was subjected to heavy-ion irradiation in order to provide improved understanding of the irradiation effect on radiation hardening associated with dislocation loop and network formation, α^’ precipitation. The specimens were irradiated with 8 MeV Fe ions (∼2 μm ion range) to midrange doses of 0.37 and 3.7 dpa at 300, 350 and 450 °C using dose rates of ∼10⁻⁵–10⁻³ dpa/s. Nanoindentation testing was performed to extract the bulk equivalent hardness at low depth from these ion irradiated specimens. High-quality transmission electron microscopy (TEM) images were acquired by utilizing a flash electropolishing method on the Focused Ion Beam (FIB) prepared liftouts. An accurate calculation of the strength factor was provided based on detailed TEM characterization of the irradiated microstructures. A newly refined hardening superposition method was applied to combine the strengthening components from each microstructure. The good agreement between microstructure predicted strength and measured strength further demonstrated the fidelity to use hardening model to quantify the mechanical properties of ion irradiated materials.

Original language	English
Article number	154823
Journal	Journal of Nuclear Materials
Volume	588
DOIs	https://doi.org/10.1016/j.jnucmat.2023.154823
State	Published - Jan 2024

Funding

This work was supported by the Office of Nuclear Energy, U.S. Department of Energy under contract DE-NE0000639 as part of the SNAP consortium research activities (PZ, SJZ). The ion irradiations and participation by YZ and YL were supported by the Office of Fusion Energy Sciences, U.S. Department of Energy under grant # DE-SC0023293 with the University of Tennessee. The fabrication of the Fe-Cr binary alloys has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training program 2019–2020 under Grant Agreement No. 633053 (JH). The APT work was conducted at the ORNL's Center for Nanophase Materials Sciences, which is a DOE Office of Science User Facility. The authors would like to acknowledge funding from the State of Tennessee and Tennessee Higher Education Commission (THEC) through their support of the Center for Materials Processing.

Funders	Funder number
State of Tennessee and Tennessee Higher Education Commission
U.S. Department of Energy	DE-NE0000639
Office of Science
Office of Nuclear Energy
Fusion Energy Sciences	DE-SC0023293
Oak Ridge National Laboratory
University of Tennessee
H2020 Euratom	633053
Tennessee Higher Education Commission

Keywords

Dislocation obstacle strengths
Hardening superposition
Microstructure

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10.1016/j.jnucmat.2023.154823

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title = "Defect-specific strength factors and superposition model for predicting strengthening of ion irradiated Fe18Cr alloy",

abstract = "A high-purity binary alloy Fe18Cr was subjected to heavy-ion irradiation in order to provide improved understanding of the irradiation effect on radiation hardening associated with dislocation loop and network formation, α{\textquoteright} precipitation. The specimens were irradiated with 8 MeV Fe ions (∼2 μm ion range) to midrange doses of 0.37 and 3.7 dpa at 300, 350 and 450 °C using dose rates of ∼10−5–10−3 dpa/s. Nanoindentation testing was performed to extract the bulk equivalent hardness at low depth from these ion irradiated specimens. High-quality transmission electron microscopy (TEM) images were acquired by utilizing a flash electropolishing method on the Focused Ion Beam (FIB) prepared liftouts. An accurate calculation of the strength factor was provided based on detailed TEM characterization of the irradiated microstructures. A newly refined hardening superposition method was applied to combine the strengthening components from each microstructure. The good agreement between microstructure predicted strength and measured strength further demonstrated the fidelity to use hardening model to quantify the mechanical properties of ion irradiated materials.",

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AU - Zhu, Pengcheng

AU - Zhao, Yajie

AU - Lin, Yan Ru

AU - Henry, Jean

AU - Zinkle, Steven J.

PY - 2024/1

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N2 - A high-purity binary alloy Fe18Cr was subjected to heavy-ion irradiation in order to provide improved understanding of the irradiation effect on radiation hardening associated with dislocation loop and network formation, α’ precipitation. The specimens were irradiated with 8 MeV Fe ions (∼2 μm ion range) to midrange doses of 0.37 and 3.7 dpa at 300, 350 and 450 °C using dose rates of ∼10−5–10−3 dpa/s. Nanoindentation testing was performed to extract the bulk equivalent hardness at low depth from these ion irradiated specimens. High-quality transmission electron microscopy (TEM) images were acquired by utilizing a flash electropolishing method on the Focused Ion Beam (FIB) prepared liftouts. An accurate calculation of the strength factor was provided based on detailed TEM characterization of the irradiated microstructures. A newly refined hardening superposition method was applied to combine the strengthening components from each microstructure. The good agreement between microstructure predicted strength and measured strength further demonstrated the fidelity to use hardening model to quantify the mechanical properties of ion irradiated materials.

AB - A high-purity binary alloy Fe18Cr was subjected to heavy-ion irradiation in order to provide improved understanding of the irradiation effect on radiation hardening associated with dislocation loop and network formation, α’ precipitation. The specimens were irradiated with 8 MeV Fe ions (∼2 μm ion range) to midrange doses of 0.37 and 3.7 dpa at 300, 350 and 450 °C using dose rates of ∼10−5–10−3 dpa/s. Nanoindentation testing was performed to extract the bulk equivalent hardness at low depth from these ion irradiated specimens. High-quality transmission electron microscopy (TEM) images were acquired by utilizing a flash electropolishing method on the Focused Ion Beam (FIB) prepared liftouts. An accurate calculation of the strength factor was provided based on detailed TEM characterization of the irradiated microstructures. A newly refined hardening superposition method was applied to combine the strengthening components from each microstructure. The good agreement between microstructure predicted strength and measured strength further demonstrated the fidelity to use hardening model to quantify the mechanical properties of ion irradiated materials.

KW - Dislocation obstacle strengths

KW - Hardening superposition

KW - Microstructure

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Defect-specific strength factors and superposition model for predicting strengthening of ion irradiated Fe18Cr alloy

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