Precipitation in proton- and ion-irradiated Alloy 625 Plus

Alloy 625 Plus is a commercial Ni-based alloy proposed as a candidate structural material for use in nuclear reactors. To clarify its microstructural evolution under relevant irradiation service conditions, we performed long term thermal aging, as well as proton and ion irradiations at similar to 300 and 400 degrees C. While cascade mixing dominates during ion irradiation, diffusional processes allow the gamma '', gamma', Ni3Si, and Pt2Mo-type ordered phases to form under proton irradiation. Moreover, comparison between solution treated and aged samples revealed steady state nanoscale patterning of the gamma '' and gamma' phases and the dependence of the formation of the Pt2Mo-type phase on the precipitation of gamma ''. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

Alloy 625 Plus, a commercial Ni-based alloy, is being considered as a potential structural material for nuclear reactors. The study conducted long term thermal aging and ion irradiations to investigate its microstructural evolution. It was found that diffusional processes under proton irradiation lead to the formation of ordered phases like γ'', γ', Ni3Si, and Pt2Mo. The research also showed the steady state nanoscale patterning of γ'' and γ' phases, as well as the dependence of Pt2Mo-type phase formation on the precipitation of γ''.