Modelling the brittle-to-ductile transition of high-purity tungsten under neutron irradiation

Mathieu Oude Vrielink; Varun Shah; J.A.W. (Hans) van Dommelen; Marc G.D. Geers

doi:10.1016/j.jnucmat.2021.153068

Modelling the brittle-to-ductile transition of high-purity tungsten under neutron irradiation

Mathieu Oude Vrielink, Varun Shah, J.A.W. (Hans) van Dommelen (Corresponding author), Marc G.D. Geers

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Abstract

Tungsten becomes significantly more brittle when exposed to neutron irradiation, which can be detrimental for the functionality of plasma facing components in nuclear fusion reactors. A predictive model of the mechanical behaviour of irradiated tungsten is therefore vital in order to assess how the brittle-to-ductile transition temperature evolves under fusion conditions. To this end, a cluster dynamics model is used to describe the defect production in high purity tungsten under neutron irradiation. The resulting defect concentrations provide input for a crystal plasticity model, capable of describing the influence of irradiation induced defects on the mechanical properties of high-purity tungsten. Simulation results reveal a striking match with experimental data in terms of yield stress at various temperatures and irradiation levels. Moreover, also the brittle-to-ductile transition temperature is adequately described by incorporating a probabilistic cleavage model.

Original language	English
Article number	153068
Number of pages	12
Journal	Journal of Nuclear Materials
Volume	554
DOIs	https://doi.org/10.1016/j.jnucmat.2021.153068
Publication status	Published - 1 Oct 2021

Funding

This research was carried out under project number 10022639 / T16010d in the framework of the Research Program of the Materials innovation institute (M2i) ( http://www.m2i.nl ) supported by the Dutch government, and within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018 and 2019-2020 under grant agreement no. 633053. The views and opinions expressed herein do not necessarily reflect those of the European Commission. The authors gratefully acknowledge Research Instruments (RI) in Germany for providing tungsten samples.

Funders	Funder number
European Union's Horizon 2020 - Research and Innovation Framework Programme	633053
Materials Innovation Institute (M2i)

Keywords

Brittle-to-ductile transition temperature,
Cluster dynamics
Crystal plasticity
Irradiation hardening
Neutron irradiation
Tungsten

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title = "Modelling the brittle-to-ductile transition of high-purity tungsten under neutron irradiation",

abstract = "Tungsten becomes significantly more brittle when exposed to neutron irradiation, which can be detrimental for the functionality of plasma facing components in nuclear fusion reactors. A predictive model of the mechanical behaviour of irradiated tungsten is therefore vital in order to assess how the brittle-to-ductile transition temperature evolves under fusion conditions. To this end, a cluster dynamics model is used to describe the defect production in high purity tungsten under neutron irradiation. The resulting defect concentrations provide input for a crystal plasticity model, capable of describing the influence of irradiation induced defects on the mechanical properties of high-purity tungsten. Simulation results reveal a striking match with experimental data in terms of yield stress at various temperatures and irradiation levels. Moreover, also the brittle-to-ductile transition temperature is adequately described by incorporating a probabilistic cleavage model.",

keywords = "Brittle-to-ductile transition temperature,, Cluster dynamics, Crystal plasticity, Irradiation hardening, Neutron irradiation, Tungsten",

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AU - Oude Vrielink, Mathieu

AU - Shah, Varun

AU - van Dommelen, J.A.W. (Hans)

AU - Geers, Marc G.D.

PY - 2021/10/1

Y1 - 2021/10/1

N2 - Tungsten becomes significantly more brittle when exposed to neutron irradiation, which can be detrimental for the functionality of plasma facing components in nuclear fusion reactors. A predictive model of the mechanical behaviour of irradiated tungsten is therefore vital in order to assess how the brittle-to-ductile transition temperature evolves under fusion conditions. To this end, a cluster dynamics model is used to describe the defect production in high purity tungsten under neutron irradiation. The resulting defect concentrations provide input for a crystal plasticity model, capable of describing the influence of irradiation induced defects on the mechanical properties of high-purity tungsten. Simulation results reveal a striking match with experimental data in terms of yield stress at various temperatures and irradiation levels. Moreover, also the brittle-to-ductile transition temperature is adequately described by incorporating a probabilistic cleavage model.

AB - Tungsten becomes significantly more brittle when exposed to neutron irradiation, which can be detrimental for the functionality of plasma facing components in nuclear fusion reactors. A predictive model of the mechanical behaviour of irradiated tungsten is therefore vital in order to assess how the brittle-to-ductile transition temperature evolves under fusion conditions. To this end, a cluster dynamics model is used to describe the defect production in high purity tungsten under neutron irradiation. The resulting defect concentrations provide input for a crystal plasticity model, capable of describing the influence of irradiation induced defects on the mechanical properties of high-purity tungsten. Simulation results reveal a striking match with experimental data in terms of yield stress at various temperatures and irradiation levels. Moreover, also the brittle-to-ductile transition temperature is adequately described by incorporating a probabilistic cleavage model.

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Modelling the brittle-to-ductile transition of high-purity tungsten under neutron irradiation

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