科研之友
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摘要
FeCrAI alloys are currently under consideration for accident-tolerant fuel cladding applications in light water reactors owing to their superior high-temperature oxidation and corrosion resistance compared to the Zr-based alloys currently employed. However, their performance could be limited by precipitation of a Cr-rich alpha' phase that tends to embrittle high-Cr ferritic Fe-based alloys. In this study, four FeCrAI model alloys with 10-18 at.% Cr and 5.8-93 at.% Al were neutron-irradiated to nominal damage doses up to 7.0 displacements per atom at a target temperature of 320 degrees C. Small angle neutron scattering techniques were coupled with atom probe tomography to assess the composition and morphology of the resulting alpha' precipitates. It was demonstrated that Al additions partially destabilize the alpha' phase, generally resulting in precipitates with lower Cr contents when compared with binary Fe-Cr systems. The precipitate morphology evolution with dose exhibited a transient coarsening regime akin to previously observed behavior in aged Fe-Cr alloys. Similar behavior to predictions of the LSW/UOKV models suggests that alpha' precipitation in irradiated FeCrAl is a diffusion-limited process with coarsening mechanisms similar to those in thermally aged high-Cr ferritic alloys.
- 出版日期2017-5-1
