TY - JOUR
T1 - Irradiation-induced Cu aggregations in Fe
T2 - An origin of embrittlement of reactor pressure vessel steels
AU - Nagai, Y.
AU - Tang, Z.
AU - Kanai, T.
AU - Saneyasu, M.
AU - Hassegawa, M.
N1 - Copyright:
Copyright 2020 Elsevier B.V., All rights reserved.
PY - 2001
Y1 - 2001
N2 - Very dilute Fe-Cu systems, model alloys of nuclear reactor pressure vessel (RPV) steels, irradiated by fast neutrons, are studied by positron annihilation experiments and simple calculations. The ultrafine Cu precipitates, which are never, formed by thermal aging in the dilute alloys, are observed clearly and are strongly suggested to be responsible for irradiation-induced embrittlement of RPV steels. The formation and recovery process of the precipitates are revealed: (i) irradiation-induced Cu-vacancy complexes aggregate into microvoids; (ii) around 400°C the dissociation of vacancies from the microvoids leads to the formation of the Cu precipitates of about 1 nm in size; and (iii) the Cu precipitates anneal out at about 650°C.
AB - Very dilute Fe-Cu systems, model alloys of nuclear reactor pressure vessel (RPV) steels, irradiated by fast neutrons, are studied by positron annihilation experiments and simple calculations. The ultrafine Cu precipitates, which are never, formed by thermal aging in the dilute alloys, are observed clearly and are strongly suggested to be responsible for irradiation-induced embrittlement of RPV steels. The formation and recovery process of the precipitates are revealed: (i) irradiation-induced Cu-vacancy complexes aggregate into microvoids; (ii) around 400°C the dissociation of vacancies from the microvoids leads to the formation of the Cu precipitates of about 1 nm in size; and (iii) the Cu precipitates anneal out at about 650°C.
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U2 - 10.1103/physrevb.63.134110
DO - 10.1103/physrevb.63.134110
M3 - Article
AN - SCOPUS:0034899440
VL - 63
SP - 1341101
EP - 1341105
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 13
M1 - 134110
ER -