The influence of manganese additions on the initial stages of the formation of copper-enriched precipitates has been investigated in Fe-0.8 at.% Cu (VH) and Fe-0.78 at.% Cu-1.05% Mn (VD) model alloys that were neutron irradiated to low fluences. These experiments are a continuation of previous atom probe tomograph (APT) and small angle neutron scattering (SANS) characterizations of these model alloys. In the previous study, these alloys were neutron irradiated to fluences of 1 * 10~(23) n m~(-2) (E > 1 MeV) [1]. In these new experiments, the VH and VD alloys were neutron irradiated to lower fluences of 4 * 10~(21) n m~(-2) and 5 * 10~(22) n m~(-2) at a temperature of 288 °C. The specimens that were neutron irradiated to a fluence of 5 * 10~(22) n m~(-2) were also examined after a post irradiation anneal (PIA) of 20 h at 400 °C.
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