Hardening mechanisms of cold rolled tungsten after neutron irradiation Indentation and finite elements modelling

Dellis Spilios; Xiazi Xiao; Dmitry Terentyev; Efthymios Manios; Konstantina Mergia

doi:10.1016/j.ijrmhm.2022.106096

Hardening mechanisms of cold rolled tungsten after neutron irradiation Indentation and finite elements modelling

Dellis Spilios, Xiazi Xiao, Dmitry Terentyev, Efthymios Manios, Konstantina Mergia

Research output › peer-review

Abstract

The mechanical properties of “cold” rolled tungsten sheet after neutron irradiation at high temperature are investigated by instrumented indentation and crystal plasticity finite element modelling (CPFEM). Neutron irradiation to a dose of 0.2 displacements per atom was performed in the temperature range from 600 to 1200 .C in the Belgian material test reactor BR2 at SCK CEN, Mol. The contribution of the irradiation damage in the constitutive laws has been deduced by utilizing the load-depth curves of the indentation measurements and incorporating microstructural information from transmission electron microscopy measurements. The simulated load-depth curves are in very good agreement with the experimental data indicating that the model can characterize the plastic deformation of the irradiated W material. It is found that the irradiation temperature has almost no effect on the load-depth curves and the hardness increase, of around 19% after irradiation, is temperature independent within errors. The formation of voids after irradiation is the main cause of irradiation induced hardening while the dislocation loops have a much lower influence. Indentation tests at low and high loading rates showed that the void dominated microstructure is more sensitive to the increase of the deformation rate.

Original language	English
Article number	106096
Number of pages	12
Journal	International Journal of Refractory Metals & Hard Materials
Volume	111
DOIs	https://doi.org/10.1016/j.ijrmhm.2022.106096
State	Published - Feb 2023

ASJC Scopus subject areas

Mechanics of Materials
Ceramics and Composites
Mechanical Engineering
Metals and Alloys
Materials Chemistry

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Cite this

@article{e2a1b826f2294d9d9a581aae4727ca0f,

title = "Hardening mechanisms of cold rolled tungsten after neutron irradiation Indentation and finite elements modelling",

abstract = "The mechanical properties of “cold” rolled tungsten sheet after neutron irradiation at high temperature are investigated by instrumented indentation and crystal plasticity finite element modelling (CPFEM). Neutron irradiation to a dose of 0.2 displacements per atom was performed in the temperature range from 600 to 1200 .C in the Belgian material test reactor BR2 at SCK CEN, Mol. The contribution of the irradiation damage in the constitutive laws has been deduced by utilizing the load-depth curves of the indentation measurements and incorporating microstructural information from transmission electron microscopy measurements. The simulated load-depth curves are in very good agreement with the experimental data indicating that the model can characterize the plastic deformation of the irradiated W material. It is found that the irradiation temperature has almost no effect on the load-depth curves and the hardness increase, of around 19% after irradiation, is temperature independent within errors. The formation of voids after irradiation is the main cause of irradiation induced hardening while the dislocation loops have a much lower influence. Indentation tests at low and high loading rates showed that the void dominated microstructure is more sensitive to the increase of the deformation rate.",

keywords = "Tungsten, Plasma facing materials, Neutron irradiation, Radiation damage, Indentation, Crystal plasticity, Finite element method",

author = "Dellis Spilios and Xiazi Xiao and Dmitry Terentyev and Efthymios Manios and Konstantina Mergia",

note = "Score=10 Funding Information: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018, 2019-2020 and 2021-2025 under Grant Agreements Nos. 633053 and 101052200. The views and opinions expressed herein do not necessarily reflect those of the European Commission. The funding from the General Secretariat of Research and Innovation of the Greek National Programme of the Controlled Thermonuclear Fusion is acknowledged. In addition, Xiazi Xiao acknowledges the support from the National Natural Science Foundation of China (NSFC) under Contract no. 12172384 . Publisher Copyright: {\textcopyright} 2022 Elsevier Ltd",

year = "2023",

month = feb,

doi = "10.1016/j.ijrmhm.2022.106096",

language = "English",

volume = "111",

journal = "International Journal of Refractory Metals & Hard Materials",

issn = "0263-4368",

publisher = "Elsevier B.V.",

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T1 - Hardening mechanisms of cold rolled tungsten after neutron irradiation Indentation and finite elements modelling

AU - Spilios, Dellis

AU - Xiao, Xiazi

AU - Terentyev, Dmitry

AU - Manios, Efthymios

AU - Mergia, Konstantina

N1 - Score=10 Funding Information: This work has been carried out within the framework of the EUROfusion Consortium and has received funding from the Euratom research and training programme 2014-2018, 2019-2020 and 2021-2025 under Grant Agreements Nos. 633053 and 101052200. The views and opinions expressed herein do not necessarily reflect those of the European Commission. The funding from the General Secretariat of Research and Innovation of the Greek National Programme of the Controlled Thermonuclear Fusion is acknowledged. In addition, Xiazi Xiao acknowledges the support from the National Natural Science Foundation of China (NSFC) under Contract no. 12172384 . Publisher Copyright: © 2022 Elsevier Ltd

PY - 2023/2

Y1 - 2023/2

N2 - The mechanical properties of “cold” rolled tungsten sheet after neutron irradiation at high temperature are investigated by instrumented indentation and crystal plasticity finite element modelling (CPFEM). Neutron irradiation to a dose of 0.2 displacements per atom was performed in the temperature range from 600 to 1200 .C in the Belgian material test reactor BR2 at SCK CEN, Mol. The contribution of the irradiation damage in the constitutive laws has been deduced by utilizing the load-depth curves of the indentation measurements and incorporating microstructural information from transmission electron microscopy measurements. The simulated load-depth curves are in very good agreement with the experimental data indicating that the model can characterize the plastic deformation of the irradiated W material. It is found that the irradiation temperature has almost no effect on the load-depth curves and the hardness increase, of around 19% after irradiation, is temperature independent within errors. The formation of voids after irradiation is the main cause of irradiation induced hardening while the dislocation loops have a much lower influence. Indentation tests at low and high loading rates showed that the void dominated microstructure is more sensitive to the increase of the deformation rate.

AB - The mechanical properties of “cold” rolled tungsten sheet after neutron irradiation at high temperature are investigated by instrumented indentation and crystal plasticity finite element modelling (CPFEM). Neutron irradiation to a dose of 0.2 displacements per atom was performed in the temperature range from 600 to 1200 .C in the Belgian material test reactor BR2 at SCK CEN, Mol. The contribution of the irradiation damage in the constitutive laws has been deduced by utilizing the load-depth curves of the indentation measurements and incorporating microstructural information from transmission electron microscopy measurements. The simulated load-depth curves are in very good agreement with the experimental data indicating that the model can characterize the plastic deformation of the irradiated W material. It is found that the irradiation temperature has almost no effect on the load-depth curves and the hardness increase, of around 19% after irradiation, is temperature independent within errors. The formation of voids after irradiation is the main cause of irradiation induced hardening while the dislocation loops have a much lower influence. Indentation tests at low and high loading rates showed that the void dominated microstructure is more sensitive to the increase of the deformation rate.

KW - Tungsten

KW - Plasma facing materials

KW - Neutron irradiation

KW - Radiation damage

KW - Indentation

KW - Crystal plasticity

KW - Finite element method

UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/53002526

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DO - 10.1016/j.ijrmhm.2022.106096

M3 - Article

SN - 0263-4368

VL - 111

JO - International Journal of Refractory Metals & Hard Materials

JF - International Journal of Refractory Metals & Hard Materials

M1 - 106096

ER -