The influence of carbon impurities on the formation of loops in tungsten irradiated with self-ions

Jari Likonen, Nicolas Castin (Corresponding Author), A Dubinko, G Bonny, Andree De Backer, Andrea Sand, Kalle Heinola, D. Terentyev

    Research output: Contribution to journalArticleScientificpeer-review

    Abstract

    The microstructure changes taking place in W under irradiation are governed by many factors, amongst which C impurities and their interactions with self-interstitial atoms (SIA). In this work, we specifically study this effect by conducting a dedicated 2-MeV self-ions irradiation experiment, at room temperature. Samples were irradiated up to 0.02, 0.15 and 1.2 dpa. Transmission electron microscopy (TEM) expectedly revealed a large density of SIA loops at all these doses. Surprisingly, however, the loop number density increased in a non-monotonous manner with the received dose. Performing chemical analysis with secondary ion spectroscopy measurements (SIMS), we find that our samples were likely contaminated by C injection during the irradiation. Employing an object kinetic Monte Carlo (OKMC) model for microstructure evolution, we demonstrate that the C injection is the likely factor explaining the evolution of loops number density. Our findings highlight the importance of the well-known issue of C injection during ion irradiation experiments, and demonstrate how OKMC models can help to rationalize this effect.
    Original languageEnglish
    Article number151808
    Number of pages8
    JournalJournal of Nuclear Materials
    Volume527
    DOIs
    Publication statusPublished - 2019
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    Tungsten
    Ion bombardment
    tungsten
    Carbon
    Irradiation
    Impurities
    Ions
    injection
    ion irradiation
    impurities
    Atoms
    Microstructure
    Kinetics
    carbon
    interstitials
    dosage
    microstructure
    ions
    irradiation
    Experiments

    Cite this

    Likonen, Jari ; Castin, Nicolas ; Dubinko, A ; Bonny, G ; De Backer, Andree ; Sand, Andrea ; Heinola, Kalle ; Terentyev, D. / The influence of carbon impurities on the formation of loops in tungsten irradiated with self-ions. In: Journal of Nuclear Materials. 2019 ; Vol. 527.
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    abstract = "The microstructure changes taking place in W under irradiation are governed by many factors, amongst which C impurities and their interactions with self-interstitial atoms (SIA). In this work, we specifically study this effect by conducting a dedicated 2-MeV self-ions irradiation experiment, at room temperature. Samples were irradiated up to 0.02, 0.15 and 1.2 dpa. Transmission electron microscopy (TEM) expectedly revealed a large density of SIA loops at all these doses. Surprisingly, however, the loop number density increased in a non-monotonous manner with the received dose. Performing chemical analysis with secondary ion spectroscopy measurements (SIMS), we find that our samples were likely contaminated by C injection during the irradiation. Employing an object kinetic Monte Carlo (OKMC) model for microstructure evolution, we demonstrate that the C injection is the likely factor explaining the evolution of loops number density. Our findings highlight the importance of the well-known issue of C injection during ion irradiation experiments, and demonstrate how OKMC models can help to rationalize this effect.",
    author = "Jari Likonen and Nicolas Castin and A Dubinko and G Bonny and {De Backer}, Andree and Andrea Sand and Kalle Heinola and D. Terentyev",
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    language = "English",
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    The influence of carbon impurities on the formation of loops in tungsten irradiated with self-ions. / Likonen, Jari; Castin, Nicolas (Corresponding Author); Dubinko, A; Bonny, G; De Backer, Andree; Sand, Andrea; Heinola, Kalle; Terentyev, D.

    In: Journal of Nuclear Materials, Vol. 527, 151808, 2019.

    Research output: Contribution to journalArticleScientificpeer-review

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    T1 - The influence of carbon impurities on the formation of loops in tungsten irradiated with self-ions

    AU - Likonen, Jari

    AU - Castin, Nicolas

    AU - Dubinko, A

    AU - Bonny, G

    AU - De Backer, Andree

    AU - Sand, Andrea

    AU - Heinola, Kalle

    AU - Terentyev, D.

    PY - 2019

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    AB - The microstructure changes taking place in W under irradiation are governed by many factors, amongst which C impurities and their interactions with self-interstitial atoms (SIA). In this work, we specifically study this effect by conducting a dedicated 2-MeV self-ions irradiation experiment, at room temperature. Samples were irradiated up to 0.02, 0.15 and 1.2 dpa. Transmission electron microscopy (TEM) expectedly revealed a large density of SIA loops at all these doses. Surprisingly, however, the loop number density increased in a non-monotonous manner with the received dose. Performing chemical analysis with secondary ion spectroscopy measurements (SIMS), we find that our samples were likely contaminated by C injection during the irradiation. Employing an object kinetic Monte Carlo (OKMC) model for microstructure evolution, we demonstrate that the C injection is the likely factor explaining the evolution of loops number density. Our findings highlight the importance of the well-known issue of C injection during ion irradiation experiments, and demonstrate how OKMC models can help to rationalize this effect.

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