Accelerated formation of M2C carbides by proton irradiation inhibits molten salt corrosion in Ni-based alloy

The effect of displacement damage on the corrosion behavior in a molten FLiBe salt environment was investigated. The element distribution and microstructure around the grain boundaries (GBs) after corrosion were characterized. The results show a decrease in corrosion thickness with increasing irradi...

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Bibliographic Details
Published in:Journal of materials research and technology 2024-11, Vol.33, p.742-748
Main Authors: Ji, Weichi, Zhu, Zhenbo, Huang, Hefei, Li, Cheng, Lei, Guanhong, Li, Yan
Format: Article
Language:English
Subjects:
M2C carbides
Molten salt corrosion
Nickel based alloy
Proton irradiation
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Summary:The effect of displacement damage on the corrosion behavior in a molten FLiBe salt environment was investigated. The element distribution and microstructure around the grain boundaries (GBs) after corrosion were characterized. The results show a decrease in corrosion thickness with increasing irradiation dose and the presence of intergranular corrosion. Nanoscales M2C carbides were observed to be distributed, with a denser and thicker distribution in samples with higher irradiation doses. Their distribution depth is related to the Cr depletion region, inhibiting Cr diffusion toward the GBs and surface. Furthermore, the nucleation mechanism of M2C carbides along the GBs and in irradiated regions was revealed, attributed to the combined effects of thermal influences, element preferential dissolution due to corrosion, and irradiation-induced segregation.
ISSN:2238-7854
DOI:10.1016/j.jmrt.2024.09.142