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

F. Tuomisto (Corresponding Author), I. Makkonen, Janne Heikinheimo, F. Granberg, F. Djurabekova, K. Nordlund, G. Velisa, H. Bei, H. Xue, W. J. Weber, Y. Zhang

Research output: Contribution to journalArticleScientificpeer-review

40 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)44-51
JournalActa Materialia
Publication statusPublished - 1 Sept 2020
MoE publication typeA1 Journal article-refereed


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