Trends in vacancy distribution and hardness of high temperature neutron irradiated single crystal tungsten

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@article{1c43293958ea42c3b0ba544b850b7334,
title = "Trends in vacancy distribution and hardness of high temperature neutron irradiated single crystal tungsten",
abstract = "The aim of the present study is to extend the knowledge about the formation and thermal stability of vacancy-type defects in tungsten under neutron irradiation, thereby mimicking the temperature and neutron flux expected in the ITER divertor. Neutron irradiation of single crystal tungsten, W(100), in the temperature range 600-1200 °C is performed up to 0.12 dpa. Positron annihilation spectroscopy is employed to detect the presence of open volume defects, while hardness tests are applied to relate the irradiation-induced defects with the modification of mechanical properties. Rationalization of the experimental results is enhanced by the application of a kinetic Monte Carlo simulation tool, applied to model the microstructural evolution under the neutron irradiation process. The relation between radiation microstructure and hardness is explained via a dispersed barrier model.",
keywords = "Tungsten, Neutron irradiation, Positron annihilation spectroscopy, Micro-hardness, Kinetic Monte Carlo, Dispersed barrier model",
author = "Giovanni Bonny and Milan Konstantinovic and Anastasiia Bakaeva and Chao Yin and Nicolas Castin and Konstantina Mergia and Vasileois Chatzikos and Spilios Dellis and Tymofii Khvan and Alexander Bakaev and Andrii Dubinko and Dmitry Terentyev",
note = "Score=10",
year = "2020",
month = "10",
day = "1",
doi = "10.1016/j.actamat.2020.07.047",
language = "English",
volume = "198",
pages = "1--9",
journal = "Acta Materialia",
issn = "1359-6454",
publisher = "Elsevier",

}

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TY - JOUR

T1 - Trends in vacancy distribution and hardness of high temperature neutron irradiated single crystal tungsten

AU - Bonny, Giovanni

AU - Konstantinovic, Milan

AU - Bakaeva, Anastasiia

AU - Yin, Chao

AU - Castin, Nicolas

AU - Mergia, Konstantina

AU - Chatzikos, Vasileois

AU - Dellis, Spilios

AU - Khvan, Tymofii

AU - Bakaev, Alexander

AU - Dubinko, Andrii

AU - Terentyev, Dmitry

N1 - Score=10

PY - 2020/10/1

Y1 - 2020/10/1

N2 - The aim of the present study is to extend the knowledge about the formation and thermal stability of vacancy-type defects in tungsten under neutron irradiation, thereby mimicking the temperature and neutron flux expected in the ITER divertor. Neutron irradiation of single crystal tungsten, W(100), in the temperature range 600-1200 °C is performed up to 0.12 dpa. Positron annihilation spectroscopy is employed to detect the presence of open volume defects, while hardness tests are applied to relate the irradiation-induced defects with the modification of mechanical properties. Rationalization of the experimental results is enhanced by the application of a kinetic Monte Carlo simulation tool, applied to model the microstructural evolution under the neutron irradiation process. The relation between radiation microstructure and hardness is explained via a dispersed barrier model.

AB - The aim of the present study is to extend the knowledge about the formation and thermal stability of vacancy-type defects in tungsten under neutron irradiation, thereby mimicking the temperature and neutron flux expected in the ITER divertor. Neutron irradiation of single crystal tungsten, W(100), in the temperature range 600-1200 °C is performed up to 0.12 dpa. Positron annihilation spectroscopy is employed to detect the presence of open volume defects, while hardness tests are applied to relate the irradiation-induced defects with the modification of mechanical properties. Rationalization of the experimental results is enhanced by the application of a kinetic Monte Carlo simulation tool, applied to model the microstructural evolution under the neutron irradiation process. The relation between radiation microstructure and hardness is explained via a dispersed barrier model.

KW - Tungsten

KW - Neutron irradiation

KW - Positron annihilation spectroscopy

KW - Micro-hardness

KW - Kinetic Monte Carlo

KW - Dispersed barrier model

UR - https://ecm.sckcen.be/OTCS/llisapi.dll/overview/39598737

U2 - 10.1016/j.actamat.2020.07.047

DO - 10.1016/j.actamat.2020.07.047

M3 - Article

VL - 198

SP - 1

EP - 9

JO - Acta Materialia

JF - Acta Materialia

SN - 1359-6454

ER -

ID: 6891900