TY - JOUR
T1 - Influence of displacement damages on deuterium retention in reduced activation ferritic/martensitic steels F82H and Eurofer97
AU - Alimov, Vladimir Kh
AU - Hatano, Yuji
AU - Sugiyama, Kazuyoshi
AU - Kondo, Sosuke
AU - Hinoki, Tatsuya
AU - Tokitani, Masayuki
N1 - Publisher Copyright:
© 2016 Elsevier B.V.
Copyright:
Copyright 2016 Elsevier B.V., All rights reserved.
PY - 2016/12/1
Y1 - 2016/12/1
N2 - The F82H and Eurofer97 steel samples were irradiated at 300 K with 20 MeV W ions to the damage level of 0.54 displacements per atom (dpa) at the damage peak. Additionally, the F82H steel samples were irradiated at 523 K with 6.4 MeV Fe ions to various damage levels in the range from 0.02 to 12.5 dpa. The damaged samples were exposed to D2 gas at a pressure of 100 kPa and various temperatures in the range from 373 to 573 K for a certain length of time sufficient to fill ion-induced defects with deuterium. Trapping of deuterium at the ion-induced defects was examined by the D(3He, p)4He nuclear reaction with 3He energies between 0.69 and 4.0 MeV allowing determination of the D concentration up to a depth of 7 μm. It has been found that (i) at the damage level above 0.5 dpa, the concentration of the ion-induced defects responsible for trapping of diffusing D atoms does not depend practically on the numbers of displacements per atom, and (ii) the saturation value of the D concentration in the damage zone decreases with increasing D2 gas exposure temperature, Texp, and varies from about 10−1 at.% at Texp = 373 K to 10−3 at.% at Texp = 573 K. The deuterium-trap binding energy is estimated to be 0.7 ± 0.2 eV.
AB - The F82H and Eurofer97 steel samples were irradiated at 300 K with 20 MeV W ions to the damage level of 0.54 displacements per atom (dpa) at the damage peak. Additionally, the F82H steel samples were irradiated at 523 K with 6.4 MeV Fe ions to various damage levels in the range from 0.02 to 12.5 dpa. The damaged samples were exposed to D2 gas at a pressure of 100 kPa and various temperatures in the range from 373 to 573 K for a certain length of time sufficient to fill ion-induced defects with deuterium. Trapping of deuterium at the ion-induced defects was examined by the D(3He, p)4He nuclear reaction with 3He energies between 0.69 and 4.0 MeV allowing determination of the D concentration up to a depth of 7 μm. It has been found that (i) at the damage level above 0.5 dpa, the concentration of the ion-induced defects responsible for trapping of diffusing D atoms does not depend practically on the numbers of displacements per atom, and (ii) the saturation value of the D concentration in the damage zone decreases with increasing D2 gas exposure temperature, Texp, and varies from about 10−1 at.% at Texp = 373 K to 10−3 at.% at Texp = 573 K. The deuterium-trap binding energy is estimated to be 0.7 ± 0.2 eV.
KW - Deuterium trapping
KW - Ion-induced damage
KW - Reduced-activation ferritic/martensitic steel
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U2 - 10.1016/j.fusengdes.2016.02.060
DO - 10.1016/j.fusengdes.2016.02.060
M3 - Article
AN - SCOPUS:84959213315
VL - 113
SP - 336
EP - 339
JO - Fusion Engineering and Design
JF - Fusion Engineering and Design
SN - 0920-3796
ER -