The competing effects of temperature and neutron irradiation on the microstructure and mechanical properties of ITER grade tungsten

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The competing effects of temperature and neutron irradiation on the microstructure and mechanical properties of ITER grade tungsten. / Papadakis, Philippos; Spilios, Dellis; Mergia, Konstantina; Chatzikos, Vasileois; Terentyev, Dmitry; Bonny, Giovanni; Dubinko, Andrii; Van Renterghem, Wouter; Konstantinovic, Milan; Messoloras, Spyros; Pintsuk, Gerald.

In: Fusion Engineering & Design, Vol. 168, 112608, 01.07.2021, p. 1-11.

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Papadakis, Philippos ; Spilios, Dellis ; Mergia, Konstantina ; Chatzikos, Vasileois ; Terentyev, Dmitry ; Bonny, Giovanni ; Dubinko, Andrii ; Van Renterghem, Wouter ; Konstantinovic, Milan ; Messoloras, Spyros ; Pintsuk, Gerald. / The competing effects of temperature and neutron irradiation on the microstructure and mechanical properties of ITER grade tungsten. In: Fusion Engineering & Design. 2021 ; Vol. 168. pp. 1-11.

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@article{97a1d7819dfe471790a07c5eb8d8352c,
title = "The competing effects of temperature and neutron irradiation on the microstructure and mechanical properties of ITER grade tungsten",
abstract = "In the current work, ITER grade W irradiated at 1200 oC to a dose of 0.18 dpa has been investigated by Transmission Electron Microscopy (TEM), Positron Annihilation Spectroscopy (PAS), X-ray diffraction, impulse excitation and depth-sensing micro-indentation. The results are compared with those of annealed unirradiated W at 1200 oC. In the as fabricated material dislocations and small vacancy clusters of 1 to 3 vacancies are present. After annealing at 1200 oC, the small vacancy clusters disappear and only the dislocations with almost un-changed density remain. Also, hardness is reduced by 4% and creep increases by 13%. Neutron irradiation at 1200 ◦C results in the increase of the dislocation line density by 3.7 times and in the formation of dislocation loops and voids. The irradiation also causes a hardness increase of about 20% and a creep decrease of 15%. Both the elastic and shear moduli decrease by 4% after irradiation at 1200 ◦C contrary to the effect of only annealing at this temperature which causes an increase in their values by 4%. Texture changes are observed only after neutron irradiation.",
keywords = "Tungsten, Neutron irradiation, Positron Annihilation Spectroscopy, Transmission Electron Microscopy, Mechanical properties, Indentation",
author = "Philippos Papadakis and Dellis Spilios and Konstantina Mergia and Vasileois Chatzikos and Dmitry Terentyev and Giovanni Bonny and Andrii Dubinko and {Van Renterghem}, Wouter and Milan Konstantinovic and Spyros Messoloras and Gerald Pintsuk",
note = "Score=10",
year = "2021",
month = jul,
day = "1",
doi = "10.1016/j.fusengdes.2021.112608",
language = "English",
volume = "168",
pages = "1--11",
journal = "Fusion Engineering & Design",
issn = "0920-3796",
publisher = "Elsevier",

}

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TY - JOUR

T1 - The competing effects of temperature and neutron irradiation on the microstructure and mechanical properties of ITER grade tungsten

AU - Papadakis, Philippos

AU - Spilios, Dellis

AU - Mergia, Konstantina

AU - Chatzikos, Vasileois

AU - Terentyev, Dmitry

AU - Bonny, Giovanni

AU - Dubinko, Andrii

AU - Van Renterghem, Wouter

AU - Konstantinovic, Milan

AU - Messoloras, Spyros

AU - Pintsuk, Gerald

N1 - Score=10

PY - 2021/7/1

Y1 - 2021/7/1

N2 - In the current work, ITER grade W irradiated at 1200 oC to a dose of 0.18 dpa has been investigated by Transmission Electron Microscopy (TEM), Positron Annihilation Spectroscopy (PAS), X-ray diffraction, impulse excitation and depth-sensing micro-indentation. The results are compared with those of annealed unirradiated W at 1200 oC. In the as fabricated material dislocations and small vacancy clusters of 1 to 3 vacancies are present. After annealing at 1200 oC, the small vacancy clusters disappear and only the dislocations with almost un-changed density remain. Also, hardness is reduced by 4% and creep increases by 13%. Neutron irradiation at 1200 ◦C results in the increase of the dislocation line density by 3.7 times and in the formation of dislocation loops and voids. The irradiation also causes a hardness increase of about 20% and a creep decrease of 15%. Both the elastic and shear moduli decrease by 4% after irradiation at 1200 ◦C contrary to the effect of only annealing at this temperature which causes an increase in their values by 4%. Texture changes are observed only after neutron irradiation.

AB - In the current work, ITER grade W irradiated at 1200 oC to a dose of 0.18 dpa has been investigated by Transmission Electron Microscopy (TEM), Positron Annihilation Spectroscopy (PAS), X-ray diffraction, impulse excitation and depth-sensing micro-indentation. The results are compared with those of annealed unirradiated W at 1200 oC. In the as fabricated material dislocations and small vacancy clusters of 1 to 3 vacancies are present. After annealing at 1200 oC, the small vacancy clusters disappear and only the dislocations with almost un-changed density remain. Also, hardness is reduced by 4% and creep increases by 13%. Neutron irradiation at 1200 ◦C results in the increase of the dislocation line density by 3.7 times and in the formation of dislocation loops and voids. The irradiation also causes a hardness increase of about 20% and a creep decrease of 15%. Both the elastic and shear moduli decrease by 4% after irradiation at 1200 ◦C contrary to the effect of only annealing at this temperature which causes an increase in their values by 4%. Texture changes are observed only after neutron irradiation.

KW - Tungsten

KW - Neutron irradiation

KW - Positron Annihilation Spectroscopy

KW - Transmission Electron Microscopy

KW - Mechanical properties

KW - Indentation

UR - https://ecm.sckcen.be/OTCS/llisapi.dll/open/45824478

U2 - 10.1016/j.fusengdes.2021.112608

DO - 10.1016/j.fusengdes.2021.112608

M3 - Article

VL - 168

SP - 1

EP - 11

JO - Fusion Engineering & Design

JF - Fusion Engineering & Design

SN - 0920-3796

M1 - 112608

ER -

ID: 7203302