Work

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

Year: 2024

Type: article

Abstract: 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 M 2 C 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 M 2 C 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.

Source: Journal of Materials Research and Technology

DOI: 10.1016/j.jmrt.2024.09.142

Authors: Weichi Ji, Zhenbo Zhu, Hefei Huang, Cheng Li, Guanhong Lei, Yan Li

Institutions: Chinese Academy of Sciences, ShanghaiTech University, Shanghai Institute of Applied Physics, University of Chinese Academy of Sciences

Language: English

Topic: Fusion materials and technologies

Subfield: Materials Chemistry

Field: Materials Science

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $1,430

Funder: National Natural Science Foundation of China