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

Journal Article · · Acta Materialia
 [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

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.

Research Organization:
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 Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
1340453
Alternate ID(s):
OSTI ID: 1419999
Journal Information:
Acta Materialia, Vol. 126; ISSN 1359-6454
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 101 works
Citation information provided by
Web of Science

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Cited By (14)

Local Structure and Short-Range Order in a NiCoCr Solid Solution Alloy journal May 2017
Effect of atomic order/disorder on Cr segregation in Ni-Fe alloys journal September 2018
Local structure of Ni 80 X 20 (X: Cr, Mn, Pd) solid-solution alloys and its response to ion irradiation journal November 2019
Science and technology in high-entropy alloys journal January 2018
Effect of d electrons on defect properties in equiatomic NiCoCr and NiCoFeCr concentrated solid solution alloys journal January 2018
Irradiation responses and defect behavior of single-phase concentrated solid solution alloys journal September 2018
Origin of radiation resistance in multi-principal element alloys journal October 2018
Enhanced surface bombardment resistance of the CoNiCrFeMn high entropy alloy under extreme irradiation flux journal October 2019
Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys text January 2017
Chemical complexity induced local structural distortion in NiCoFeMnCr high-entropy alloy journal June 2018
Thermal Stability and Mechanical Properties of Low-Activation Single-Phase Ti-V-Ta Medium Entropy Alloys journal August 2019
Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys [Supplementary Data] preprint December 2017
Delayed damage accumulation by athermal suppression of defect production in concentrated solid solution alloys journal December 2017
Interpreting nanovoids in atom probe tomography data for accurate local compositional measurements journal February 2020