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arXiv · 2610.23627

Grain boundary strength and corrosion cracking susceptibility in TiN coatings under fission product segregation

Jia-Hong Ke·Rongjie Song
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Abstract

During fuel-cladding chemical interaction (FCCI), lanthanide fission products generated in the fuel can migrate into cladding grain boundaries (GBs), where segregation may reduce GB strength and promote corrosion cracking. We use first-principles segregation, decohesion, and bonding calculations to quantify Nd and Ce effects on six coincident-site lattice GBs in bcc Fe and TiN. For each material, segregation energies, work-of-separation values for complete interfacial cleavage, and traction-separation curves measuring ideal resistance to crack opening were evaluated within a consistent computational framework. Nd and Ce segregate favorably to both materials, and the median segregation energies are more negative in TiN, showing that TiN does not simply exclude these species from internal interfaces. The mechanical responses of Fe and TiN differ sharply. In Fe, Nd and Ce consistently reduce work of separation and peak traction, with median work-of-separation retentions of 0.72 and 0.65 and median peak-traction retentions of 0.47 and 0.43. In TiN, most decorated GBs preserve much of the clean response, with median work-of-separation retentions of 1.00 and 0.97 and median peak-traction retention of 0.85 for both fission products. Bonding analysis shows weak, occupied antibonding X-Fe replacement bonds in Fe, whereas the surrounding Ti-N network remains largely preserved after Nd/Ce segregation in TiN. These results provide atomistic support for the use of TiN and related nitride coatings to reduce FCCI damage by retaining GB strength if fission products segregate to coating internal interfaces. This retention of GB strength also provides a mechanistic descriptor for assessing coating susceptibility to FCCI-assisted corrosion cracking and environmentally assisted intergranular fracture.

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Jia-Hong Ke, Rongjie Song. 2026-10-16. Grain boundary strength and corrosion cracking susceptibility in TiN coatings under fission product segregation. https://arxiv.org/abs/2610.23627

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