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Title: 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:
 [1];  [1]; ORCiD logo [2];  [3];  [3];  [4];  [1]
  1. Drexel Univ., Philadelphia, PA (United States). Materials Science and Engineering Dept.
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science & Technology Division
  3. Univ. of Science and Technology Beijing (China). State Key Lab. for Advanced Metals and Materials
  4. 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) (SC-22). 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 (NNSFC)
OSTI Identifier:
1474462
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. doi: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. doi: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 = {2018},
month = {7}
}

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