%0 Journal Article
%A Kobayashi, Satoru
%A Murakami, Hiroaki
%A Yamamoto, Takuya
%A Robert Odette, G.
%A Horváth, Ákos
%A Feoktystov, Artem
%A Almásy, László
%T Magnetic investigations on irradiation-induced nanoscale precipitation in reactor pressure vessel steels: A first-order reversal curve study
%J Journal of nuclear materials
%V 552
%@ 0022-3115
%C Amsterdam [u.a.]
%I Elsevier Science
%M FZJ-2021-03968
%P 152973
%D 2021
%X We have investigated magnetic properties for reactor pressure vessel model alloys with variable Cu con- tents, subjected to neutron irradiation up to a fluence of 9 × 10 19 n cm −2 . Unlike a monotonic increase of microhardness with neutron fluence, the major-loop coercivity decreases at a higher fluence and the decrease becomes larger for the alloy containing a higher amount of Cu. The measurements of first-order reversal curves (FORCs) for the high-Cu alloy show that the position of the FORC distribution peak shifts toward a lower coercivity just after neutron irradiation, followed by a slight increase, associated with the broadening along both the coercivity and interaction field axes. The results can be explained by the enhancement of magnetic inhomogeneity in a matrix due to Cu precipitation and an increasing magne- tostatic interaction between local magnetic regions with different coercivity. The magnetic method using FORCs can be a possible technique which provides in-depth information on microstructural changes due to neutron irradiation, which is not obtained by measurements of a conventional major hysteresis loop.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000653052100001
%R 10.1016/j.jnucmat.2021.152973
%U https://juser.fz-juelich.de/record/902005