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

F. Tuomisto*, I. Makkonen, J. Heikinheimo, F. Granberg, F. Djurabekova, K. Nordlund, G. Velisa, H. Bei, H. Xue, W. J. Weber, Y. Zhang

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

31 Downloads (Pure)

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.

Original languageEnglish
Pages (from-to)44-51
Number of pages8
JournalActa Materialia
Volume196
DOIs
Publication statusPublished - 1 Sep 2020
MoE publication typeA1 Journal article-refereed

Fingerprint Dive into the research topics of 'Segregation of Ni at early stages of radiation damage in NiCoFeCr solid solution alloys'. Together they form a unique fingerprint.

  • Projects

    Large-scale electronic structure techniques for advanced materials characterization

    Simula, K. & Makkonen, I.

    01/09/201808/11/2019

    Project: Academy of Finland: Other research funding

    Large-scale electronic structure techniques for advanced materials characterization

    Makkonen, I.

    01/09/201522/09/2019

    Project: Academy of Finland: Other research funding

    Large-scale electronic structure techniques for advanced materials characterization

    Makkonen, I., Simula, K., Prozheeva, V. & Härkönen, J.

    01/09/201521/09/2018

    Project: Academy of Finland: Other research funding

    Cite this

    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, 196, 44-51. https://doi.org/10.1016/j.actamat.2020.06.024