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

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.

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| openaire: EC/H2020/633053/EU//EUROfusion

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10.1016/j.actamat.2020.06.024

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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

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https://urn.fi/URN:NBN:fi:aalto-202008064472

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[article-cris] Perustieteiden korkeakoulu / SCI

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

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