Journal
ACTA MATERIALIA
Volume 126, Issue -, Pages 182-193Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.actamat.2016.12.046
Keywords
Electron microscopy; Irradiated metals; Phase transformation; Segregation; Single-phase concentrated solid solution alloys
Funding
- Energy Dissipation to Defect Evolution, an Energy Frontier Research Center - U.S. Department of Energy, Office of Science
- MEXT of the Government of Japan
- Materials Research Science and Engineering Center [DMR-1121288]
- Nanoscale Science and Engineering Center at University of Wisconsin-Madison [DMR-0832760]
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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. Here we report the element segregation in CrFeCoNi, CrFeCoNiMn, and CrFeCoNiPd equiatomic alloys when subjected to 1250 kV electron irradiations at 400 degrees 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 Ll(0) (NiMn)-type ordering decomposition and < 001 >-oriented spinodal decomposition between Co/Ni and Pd, respectively. 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. (C) 2016 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.
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