Flux dependence of cluster formation in neutron irradiated weld material
Flux dependence of cluster formation in neutron irradiated weld material
Bergner, F.; Ulbricht, A.; Hein, H.; Kammel, M.
The effect of neutron flux on the formation of irradiation-induced clusters in reactor pressure vessel (RPV) steels is an unresolved issue. Small-angle neutron scattering was measured for a neutron-irradiated RPV weld material containing 0.22 wt% impurity Cu. The experiment was focused on the influence of neutron flux on the formation of irradiation-induced clusters at fixed fluence. The aim was to separate and tentatively interpret the effect of flux on the characteristics of the cluster size distribution. We have observed a pronounced effect of neutron flux on cluster size, whereas the total volume fraction of irradiation-induced clusters is insensitive to the level of flux. The result is compatible with a rate theory model according to which the range of applied fluxes covers the transition range from a flux-independent regime to a regime of cluster growth slowing down with increasing flux. The results are confronted with measured irradiation-induced changes of mechanical properties.
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Journal of Physics: Condensed Matter 20(2008), 104262
DOI: 10.1088/0953-8984/20/10/104262
Cited 33 times in Scopus
Permalink: https://www.hzdr.de/publications/Publ-10336