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Title: Mechanisms of radiation-induced segregation in CrFeCoNi-based single-phase concentrated solid solution alloys

Abstract

Single-phase concentrated solid solution alloys have attracted wide interest due to their superior mechanical properties and enhanced radiation tolerance, which make them promising candidates for the structural applications in next-generation nuclear reactors. However, little has been understood about the intrinsic stability of their as-synthesized, high-entropy configurations against radiation damage. In this paper, we report the element segregation in CrFeCoNi, CrFeCoNiMn, and CrFeCoNiPd equiatomic alloys when subjected to 1250 kV electron irradiations at 400 °C up to a damage level of 1 displacement per atom. Cr/Fe/Mn/Pd can deplete and Co/Ni can accumulate at radiation-induced dislocation loops, while the actively segregating elements are alloy-specific. Moreover, electron-irradiated matrix of CrFeCoNiMn and CrFeCoNiPd shows L10 (NiMn)-type ordering decomposition and <001>-oriented spinodal decomposition between Co/Ni and Pd, respectively. Finally, these findings are rationalized based on the atomic size difference and enthalpy of mixing between the alloying elements, and identify a new important requirement to the design of radiation-tolerant alloys through modification of the composition.

Authors:
 [1];  [1];  [1];  [2];  [2];  [3];  [3];  [4];  [1]
  1. Univ. of Wisconsin, Madison, WI (United States). Dept. of Engineering Physics
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  3. Kyushu Univ., Fukuoka (Japan). Dept. of Applied Quantum Physics and Nuclear Engineering
  4. Kyushu Univ., Fukuoka (Japan). Dept. of Materials Science and Engineering
Publication Date:
Research Org.:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Wisconsin, Madison, WI (United States); Kyushu Univ., Fukuoka (Japan); Energy Frontier Research Centers (EFRC) (United States). Energy Dissipation to Defect Evolution (EDDE)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
OSTI Identifier:
1340453
Alternate Identifier(s):
OSTI ID: 1419999
Grant/Contract Number:  
AC05-00OR22725
Resource Type:
Accepted Manuscript
Journal Name:
Acta Materialia
Additional Journal Information:
Journal Volume: 126; Journal ID: ISSN 1359-6454
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; Electron microscopy; Irradiated metals; Phase transformation; Segregation; Single-phase concentrated solid solution alloys

Citation Formats

He, Mo-Rigen, Wang, Shuai, Shi, Shi, Jin, Ke, Bei, Hongbin, Yasuda, Kazuhiro, Matsumura, Syo, Higashida, Kenji, and Robertson, Ian M. Mechanisms of radiation-induced segregation in CrFeCoNi-based single-phase concentrated solid solution alloys. United States: N. p., 2016. Web. doi:10.1016/j.actamat.2016.12.046.
He, Mo-Rigen, Wang, Shuai, Shi, Shi, Jin, Ke, Bei, Hongbin, Yasuda, Kazuhiro, Matsumura, Syo, Higashida, Kenji, & Robertson, Ian M. Mechanisms of radiation-induced segregation in CrFeCoNi-based single-phase concentrated solid solution alloys. United States. https://doi.org/10.1016/j.actamat.2016.12.046
He, Mo-Rigen, Wang, Shuai, Shi, Shi, Jin, Ke, Bei, Hongbin, Yasuda, Kazuhiro, Matsumura, Syo, Higashida, Kenji, and Robertson, Ian M. Sat . "Mechanisms of radiation-induced segregation in CrFeCoNi-based single-phase concentrated solid solution alloys". United States. https://doi.org/10.1016/j.actamat.2016.12.046. https://www.osti.gov/servlets/purl/1340453.
@article{osti_1340453,
title = {Mechanisms of radiation-induced segregation in CrFeCoNi-based single-phase concentrated solid solution alloys},
author = {He, Mo-Rigen and Wang, Shuai and Shi, Shi and Jin, Ke and Bei, Hongbin and Yasuda, Kazuhiro and Matsumura, Syo and Higashida, Kenji and Robertson, Ian M.},
abstractNote = {Single-phase concentrated solid solution alloys have attracted wide interest due to their superior mechanical properties and enhanced radiation tolerance, which make them promising candidates for the structural applications in next-generation nuclear reactors. However, little has been understood about the intrinsic stability of their as-synthesized, high-entropy configurations against radiation damage. In this paper, we report the element segregation in CrFeCoNi, CrFeCoNiMn, and CrFeCoNiPd equiatomic alloys when subjected to 1250 kV electron irradiations at 400 °C up to a damage level of 1 displacement per atom. Cr/Fe/Mn/Pd can deplete and Co/Ni can accumulate at radiation-induced dislocation loops, while the actively segregating elements are alloy-specific. Moreover, electron-irradiated matrix of CrFeCoNiMn and CrFeCoNiPd shows L10 (NiMn)-type ordering decomposition and <001>-oriented spinodal decomposition between Co/Ni and Pd, respectively. Finally, these findings are rationalized based on the atomic size difference and enthalpy of mixing between the alloying elements, and identify a new important requirement to the design of radiation-tolerant alloys through modification of the composition.},
doi = {10.1016/j.actamat.2016.12.046},
journal = {Acta Materialia},
number = ,
volume = 126,
place = {United States},
year = {Sat Dec 31 00:00:00 EST 2016},
month = {Sat Dec 31 00:00:00 EST 2016}
}

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