Long-term microstructural evolution of tungsten under heat and neutron loads

A. Mannheim, J.A.W. van Dommelen (Corresponding author), M.G.D. Geers

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Uittreksel

In nuclear fusion reactors, tungsten will be exposed to high neutron loads at high temperatures (>900 °C). The evolution and degradation of the mechanical properties under these conditions is uncertain and therefore constitutes a major risk. Here, the microstructural evolution of tungsten under combined heat and neutron loads is explored, using a multi-scale approach incorporating clusters dynamics and a mean-field recrystallization model. The mean-field recrystallization model contains both nucleation in the bulk and at the grain boundaries. The cluster dynamics model includes the incorporation of loops in the dynamics of the dislocation network as a mechanism. The effects of bulk nucleation on the microstructural evolution are explored. The simulations predict a cyclically occurring neutron-induced recrystallization at all studied temperatures. Furthermore, the evolution of the irradiation hardening during neutron-induced recrystallization is assessed from the simulated microstructures.

TaalEngels
Artikelnummer109146
Aantal pagina's19
TijdschriftComputational Materials Science
Volume170
DOI's
StatusGepubliceerd - 1 dec 2019

Vingerafdruk

Recrystallization
Tungsten
Microstructural evolution
Neutron
Neutrons
tungsten
Heat
neutrons
heat
Nucleation
Mean Field
nucleation
fusion reactors
Fusion reactors
Grain Boundary
Hardening
Dislocation
nuclear fusion
dynamic models
hardening

Trefwoorden

    Citeer dit

    @article{81375043ce3c40bbae1d09fa9d25808f,
    title = "Long-term microstructural evolution of tungsten under heat and neutron loads",
    abstract = "In nuclear fusion reactors, tungsten will be exposed to high neutron loads at high temperatures (>900 °C). The evolution and degradation of the mechanical properties under these conditions is uncertain and therefore constitutes a major risk. Here, the microstructural evolution of tungsten under combined heat and neutron loads is explored, using a multi-scale approach incorporating clusters dynamics and a mean-field recrystallization model. The mean-field recrystallization model contains both nucleation in the bulk and at the grain boundaries. The cluster dynamics model includes the incorporation of loops in the dynamics of the dislocation network as a mechanism. The effects of bulk nucleation on the microstructural evolution are explored. The simulations predict a cyclically occurring neutron-induced recrystallization at all studied temperatures. Furthermore, the evolution of the irradiation hardening during neutron-induced recrystallization is assessed from the simulated microstructures.",
    keywords = "Cluster dynamics, Grain growth, Mean-field modelling, Neutron irradiation, Recrystallization, Tungsten",
    author = "A. Mannheim and {van Dommelen}, J.A.W. and M.G.D. Geers",
    year = "2019",
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    doi = "10.1016/j.commatsci.2019.109146",
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    journal = "Computational Materials Science",
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    Long-term microstructural evolution of tungsten under heat and neutron loads. / Mannheim, A.; van Dommelen, J.A.W. (Corresponding author); Geers, M.G.D.

    In: Computational Materials Science, Vol. 170, 109146, 01.12.2019.

    Onderzoeksoutput: Bijdrage aan tijdschriftTijdschriftartikelAcademicpeer review

    TY - JOUR

    T1 - Long-term microstructural evolution of tungsten under heat and neutron loads

    AU - Mannheim,A.

    AU - van Dommelen,J.A.W.

    AU - Geers,M.G.D.

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    Y1 - 2019/12/1

    N2 - In nuclear fusion reactors, tungsten will be exposed to high neutron loads at high temperatures (>900 °C). The evolution and degradation of the mechanical properties under these conditions is uncertain and therefore constitutes a major risk. Here, the microstructural evolution of tungsten under combined heat and neutron loads is explored, using a multi-scale approach incorporating clusters dynamics and a mean-field recrystallization model. The mean-field recrystallization model contains both nucleation in the bulk and at the grain boundaries. The cluster dynamics model includes the incorporation of loops in the dynamics of the dislocation network as a mechanism. The effects of bulk nucleation on the microstructural evolution are explored. The simulations predict a cyclically occurring neutron-induced recrystallization at all studied temperatures. Furthermore, the evolution of the irradiation hardening during neutron-induced recrystallization is assessed from the simulated microstructures.

    AB - In nuclear fusion reactors, tungsten will be exposed to high neutron loads at high temperatures (>900 °C). The evolution and degradation of the mechanical properties under these conditions is uncertain and therefore constitutes a major risk. Here, the microstructural evolution of tungsten under combined heat and neutron loads is explored, using a multi-scale approach incorporating clusters dynamics and a mean-field recrystallization model. The mean-field recrystallization model contains both nucleation in the bulk and at the grain boundaries. The cluster dynamics model includes the incorporation of loops in the dynamics of the dislocation network as a mechanism. The effects of bulk nucleation on the microstructural evolution are explored. The simulations predict a cyclically occurring neutron-induced recrystallization at all studied temperatures. Furthermore, the evolution of the irradiation hardening during neutron-induced recrystallization is assessed from the simulated microstructures.

    KW - Cluster dynamics

    KW - Grain growth

    KW - Mean-field modelling

    KW - Neutron irradiation

    KW - Recrystallization

    KW - Tungsten

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