Analysis of position-dependent cavity parameters in irradiated metals to obtain insight on fundamental defect migration phenomena☆

Yan Ru Lin; Arunodaya Bhattacharya; Steven J. Zinkle

doi:10.1016/j.matdes.2023.111668

Analysis of position-dependent cavity parameters in irradiated metals to obtain insight on fundamental defect migration phenomena^☆

Yan Ru Lin, Arunodaya Bhattacharya, Steven J. Zinkle

Radiation Effects and Microstructural An

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

18 Scopus citations

Abstract

Motion of point defects is a fundamental process that governs microstructure and properties of materials. Here, we examine the near-surface and grain boundary cavity swelling depth profiles in neutron- and ion-irradiated simple metals (Cu, Ni, and Fe-Cr) and investigate diffusional broadening of implanted Ni ions in Fe-Cr alloys. Vacancy migration energies and radiation-enhanced diffusion were experimentally estimated. Cavity denuded zone widths near planar sinks are shown to be dependent on temperature, damage rate, balance of point defects and sinks, and vacancy migration energies. An enhanced cavity swelling zone adjacent to the void-denuded zone was observed in specimens with low to moderate sink strength and interpreted as evidence of 1D gliding interstitial clusters. Radiation-enhanced diffusional broadening of implanted Ni ions (at 400–550 °C) in Fe and Fe-Cr was up to 250 nm toward the surface, which leads to a much broader near-peak-damage region where cavity swelling is suppressed. Diffusional broadening of implanted ions is calculated to be similarly pronounced for self-ion irradiations, particularly near the peak and higher swelling temperature regimes. Adequately high ion energies (∼8–15 MeV) are recommended for ion-irradiation studies to provide a sufficiently broad midrange safe analysis region with minimized surface and injected ion effects.

Original language	English
Article number	111668
Journal	Materials and Design
Volume	226
DOIs	https://doi.org/10.1016/j.matdes.2023.111668
State	Published - Feb 2023

Funding

This manuscript has been authored by UT-Battelle, LLC under Contract No. DE-AC05-00OR22725 with the U.S. Department of Energy. The United States Government retains and the publisher, by accepting the article for publication, acknowledges that the United States Government retains a non-exclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript, or allow others to do so. The Department of Energy will provide public access to these results with full access to the published paper of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). We acknowledge Mao-Yuan Luo and E-Wen Huang for their assistance with SIMS analysis, which was supported by National Yang Ming Chiao Tung University, Taiwan. We thank Dr. Peter Doyle for providing the MATLAB routines for the radiation enhanced diffusion modeling. We thank Drs. Roger Stoller, Brian Wirth, William Weber, and Haixuan Xu for their insightful comments and suggestions. Funding: This research was sponsored by the Office of Fusion Energy Sciences, U.S. Department of Energy under grant # DE-SC0006661 with the University of Tennessee (YRL and SJZ) and contract DE-AC05-00OR22725 with UT-Battelle, LLC (AB and SJZ). 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. The authors would also like to acknowledge funding from the State of Tennessee and Tennessee Higher Education Commission (THEC) through their support of the Center for Materials Processing.

Keywords

Ion implantation
Irradiation effects
Radiation enhanced diffusion
Safe analysis zone
Vacancy migration energy
Void/cavity denuded zone

Access to Document

10.1016/j.matdes.2023.111668

Cite this

@article{3e2774e52755463bb74ae0bcb9848016,

title = "Analysis of position-dependent cavity parameters in irradiated metals to obtain insight on fundamental defect migration phenomena☆",

abstract = "Motion of point defects is a fundamental process that governs microstructure and properties of materials. Here, we examine the near-surface and grain boundary cavity swelling depth profiles in neutron- and ion-irradiated simple metals (Cu, Ni, and Fe-Cr) and investigate diffusional broadening of implanted Ni ions in Fe-Cr alloys. Vacancy migration energies and radiation-enhanced diffusion were experimentally estimated. Cavity denuded zone widths near planar sinks are shown to be dependent on temperature, damage rate, balance of point defects and sinks, and vacancy migration energies. An enhanced cavity swelling zone adjacent to the void-denuded zone was observed in specimens with low to moderate sink strength and interpreted as evidence of 1D gliding interstitial clusters. Radiation-enhanced diffusional broadening of implanted Ni ions (at 400–550 °C) in Fe and Fe-Cr was up to 250 nm toward the surface, which leads to a much broader near-peak-damage region where cavity swelling is suppressed. Diffusional broadening of implanted ions is calculated to be similarly pronounced for self-ion irradiations, particularly near the peak and higher swelling temperature regimes. Adequately high ion energies (∼8–15 MeV) are recommended for ion-irradiation studies to provide a sufficiently broad midrange safe analysis region with minimized surface and injected ion effects.",

keywords = "Ion implantation, Irradiation effects, Radiation enhanced diffusion, Safe analysis zone, Vacancy migration energy, Void/cavity denuded zone",

author = "Lin, \{Yan Ru\} and Arunodaya Bhattacharya and Zinkle, \{Steven J.\}",

note = "Publisher Copyright: {\textcopyright} 2023 The Authors",

year = "2023",

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doi = "10.1016/j.matdes.2023.111668",

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T1 - Analysis of position-dependent cavity parameters in irradiated metals to obtain insight on fundamental defect migration phenomena☆

AU - Lin, Yan Ru

AU - Bhattacharya, Arunodaya

AU - Zinkle, Steven J.

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N2 - Motion of point defects is a fundamental process that governs microstructure and properties of materials. Here, we examine the near-surface and grain boundary cavity swelling depth profiles in neutron- and ion-irradiated simple metals (Cu, Ni, and Fe-Cr) and investigate diffusional broadening of implanted Ni ions in Fe-Cr alloys. Vacancy migration energies and radiation-enhanced diffusion were experimentally estimated. Cavity denuded zone widths near planar sinks are shown to be dependent on temperature, damage rate, balance of point defects and sinks, and vacancy migration energies. An enhanced cavity swelling zone adjacent to the void-denuded zone was observed in specimens with low to moderate sink strength and interpreted as evidence of 1D gliding interstitial clusters. Radiation-enhanced diffusional broadening of implanted Ni ions (at 400–550 °C) in Fe and Fe-Cr was up to 250 nm toward the surface, which leads to a much broader near-peak-damage region where cavity swelling is suppressed. Diffusional broadening of implanted ions is calculated to be similarly pronounced for self-ion irradiations, particularly near the peak and higher swelling temperature regimes. Adequately high ion energies (∼8–15 MeV) are recommended for ion-irradiation studies to provide a sufficiently broad midrange safe analysis region with minimized surface and injected ion effects.

AB - Motion of point defects is a fundamental process that governs microstructure and properties of materials. Here, we examine the near-surface and grain boundary cavity swelling depth profiles in neutron- and ion-irradiated simple metals (Cu, Ni, and Fe-Cr) and investigate diffusional broadening of implanted Ni ions in Fe-Cr alloys. Vacancy migration energies and radiation-enhanced diffusion were experimentally estimated. Cavity denuded zone widths near planar sinks are shown to be dependent on temperature, damage rate, balance of point defects and sinks, and vacancy migration energies. An enhanced cavity swelling zone adjacent to the void-denuded zone was observed in specimens with low to moderate sink strength and interpreted as evidence of 1D gliding interstitial clusters. Radiation-enhanced diffusional broadening of implanted Ni ions (at 400–550 °C) in Fe and Fe-Cr was up to 250 nm toward the surface, which leads to a much broader near-peak-damage region where cavity swelling is suppressed. Diffusional broadening of implanted ions is calculated to be similarly pronounced for self-ion irradiations, particularly near the peak and higher swelling temperature regimes. Adequately high ion energies (∼8–15 MeV) are recommended for ion-irradiation studies to provide a sufficiently broad midrange safe analysis region with minimized surface and injected ion effects.

KW - Ion implantation

KW - Irradiation effects

KW - Radiation enhanced diffusion

KW - Safe analysis zone

KW - Vacancy migration energy

KW - Void/cavity denuded zone

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