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
SN - 1359-6454
VL - 198
SP - 1
EP - 9
JO - Acta Materialia
JF - Acta Materialia
ER -