TY  - JOUR
AU  - Kobayashi, Satoru
AU  - Murakami, Hiroaki
AU  - Yamamoto, Takuya
AU  - Robert Odette, G.
AU  - Horváth, Ákos
AU  - Feoktystov, Artem
AU  - Almásy, László
TI  - Magnetic investigations on irradiation-induced nanoscale precipitation in reactor pressure vessel steels: A first-order reversal curve study
JO  - Journal of nuclear materials
VL  - 552
SN  - 0022-3115
CY  - Amsterdam [u.a.]
PB  - Elsevier Science
M1  - FZJ-2021-03968
SP  - 152973
PY  - 2021
AB  - 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.
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000653052100001
DO  - DOI:10.1016/j.jnucmat.2021.152973
UR  - https://juser.fz-juelich.de/record/902005
ER  -