Segregation of Ni at early stages of radiation damage in NiCoFeCr solid solution alloys

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Tuomisto , F , Makkonen , I , Heikinheimo , J , Granberg , F , Djurabekova , F , Nordlund , K , Velisa , G , Bei , H , Xue , H , Weber , W J & Zhang , Y 2020 , ' Segregation of Ni at early stages of radiation damage in NiCoFeCr solid solution alloys ' , Acta Materialia , vol. 196 , pp. 44-51 . https://doi.org/10.1016/j.actamat.2020.06.024

Title: Segregation of Ni at early stages of radiation damage in NiCoFeCr solid solution alloys
Author: Tuomisto, F.; Makkonen, I.; Heikinheimo, J.; Granberg, F.; Djurabekova, F.; Nordlund, K.; Velisa, G.; Bei, H.; Xue, H.; Weber, W. J.; Zhang, Y.
Contributor: University of Helsinki, Department of Physics
University of Helsinki, Materials Physics
University of Helsinki, Materials Physics
University of Helsinki, Department of Physics
University of Helsinki, Department of Physics
Date: 2020-09-01
Language: eng
Number of pages: 8
Belongs to series: Acta Materialia
ISSN: 1359-6454
URI: http://hdl.handle.net/10138/318936
Abstract: Defect evolution under irradiation is investigated in a set of single-phase concentrated solid solution alloys (SP-CSAs) containing Ni with Co, Fe and/or Cr. We show that atomic segregation of Ni takes place already at very early stages of radiation damage in the 2-4 element SP-CSAs containing Fe or Cr, well below 1 dpa. We arrive at this conclusion by following the evolution of positron annihilation signals as a function of irradiation dose in single crystal samples, complemented by molecular dynamics simulations in the same model systems for high entropy alloys (HEAs). This manifestation of short-range order calls attention to composition fluctuations at the atomic level in irradiated HEAs. Ion irradiation may induce short-range order in certain alloys due to chemically biased elemental diffusion. The work highlights the necessity of updating the assumption of a totally random arrangement in the irradiated alloys, even though the alloys before irradiation have random arrangements of different chemical elements. (C) 2020 Acta Materialia Inc. Published by Elsevier Ltd.
Subject: HIGH-ENTROPY ALLOYS
TOTAL-ENERGY CALCULATIONS
POSITRON-LIFETIME
DEFECT PRODUCTION
TRACER DIFFUSION
ELECTRON
SEMICONDUCTORS
ANNIHILATION
COCRFENI
KINETICS
114 Physical sciences
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