Exploring radiation induced segregation mechanisms at grain boundaries in equiatomic CoCrFeNiMn high entropy alloy under heavy ion irradiation
Abstract
High entropy alloys have gained significant interest due to several unique properties including enhanced radiation resistance. Here, radiation induced segregation, a key phenomenon observed in alloys under irradiation, is examined for the first time at high angle grain boundaries under Ni heavy ion irradiation in the CoCrFeNiMn alloy. Our experimental study indicates significant Mn depletion and Co and Ni enrichment at grain boundaries. The segregation is discussed in the context of a proposed vacancy dominated radiation induced segregation mechanism and compared to existing models in conventional single core component alloys including stainless steels.
- Authors:
-
- Drexel Univ., Philadelphia, PA (United States). Materials Science and Engineering Dept.
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
- Univ. of Science and Technology Beijing (China). State Key Lab. for Advanced Metals and Materials
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Publication Date:
- Research Org.:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities Division; USDOE Office of Nuclear Energy (NE), Fuel Cycle Technologies (NE-5); National Science Foundation (NSF); National Natural Science Foundation of China (NSFC)
- OSTI Identifier:
- 1474462
- Alternate Identifier(s):
- OSTI ID: 1702952
- Grant/Contract Number:
- AC05-00OR22725; 1429661; 1105681; SC0008274; AC52-06NA25396; 50471025; 51470124
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Scripta Materialia
- Additional Journal Information:
- Journal Volume: 156; Journal Issue: C; Journal ID: ISSN 1359-6462
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 36 MATERIALS SCIENCE; High entropy alloys; Radiation induced segregation; Grain boundaries; Chemical complexity; Radiation damage
Citation Formats
Barr, Christopher M., Nathaniel, James E., Unocic, Kinga A., Liu, Junpeng, Zhang, Yong, Wang, Yongqiang, and Taheri, Mitra L. Exploring radiation induced segregation mechanisms at grain boundaries in equiatomic CoCrFeNiMn high entropy alloy under heavy ion irradiation. United States: N. p., 2018.
Web. doi:10.1016/j.scriptamat.2018.06.041.
Barr, Christopher M., Nathaniel, James E., Unocic, Kinga A., Liu, Junpeng, Zhang, Yong, Wang, Yongqiang, & Taheri, Mitra L. Exploring radiation induced segregation mechanisms at grain boundaries in equiatomic CoCrFeNiMn high entropy alloy under heavy ion irradiation. United States. https://doi.org/10.1016/j.scriptamat.2018.06.041
Barr, Christopher M., Nathaniel, James E., Unocic, Kinga A., Liu, Junpeng, Zhang, Yong, Wang, Yongqiang, and Taheri, Mitra L. Fri .
"Exploring radiation induced segregation mechanisms at grain boundaries in equiatomic CoCrFeNiMn high entropy alloy under heavy ion irradiation". United States. https://doi.org/10.1016/j.scriptamat.2018.06.041. https://www.osti.gov/servlets/purl/1474462.
@article{osti_1474462,
title = {Exploring radiation induced segregation mechanisms at grain boundaries in equiatomic CoCrFeNiMn high entropy alloy under heavy ion irradiation},
author = {Barr, Christopher M. and Nathaniel, James E. and Unocic, Kinga A. and Liu, Junpeng and Zhang, Yong and Wang, Yongqiang and Taheri, Mitra L.},
abstractNote = {High entropy alloys have gained significant interest due to several unique properties including enhanced radiation resistance. Here, radiation induced segregation, a key phenomenon observed in alloys under irradiation, is examined for the first time at high angle grain boundaries under Ni heavy ion irradiation in the CoCrFeNiMn alloy. Our experimental study indicates significant Mn depletion and Co and Ni enrichment at grain boundaries. The segregation is discussed in the context of a proposed vacancy dominated radiation induced segregation mechanism and compared to existing models in conventional single core component alloys including stainless steels.},
doi = {10.1016/j.scriptamat.2018.06.041},
journal = {Scripta Materialia},
number = C,
volume = 156,
place = {United States},
year = {Fri Jul 20 00:00:00 EDT 2018},
month = {Fri Jul 20 00:00:00 EDT 2018}
}
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Cited by: 42 works
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Figures / Tables:
Fig. 1: Inverse pole figure colored map of the coarse grain CoCrFeNiMn used for the ion irradiation; (b) SRIM calculated dpa as function of cross-sectional depth for 3 MeV Ni+ irradiations; (c) STEM-ADF image of irradiated sample with implanted Ni end of range and surface highlighted.
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