J. Mater. Sci. Technol. ›› 2026, Vol. 263: 76-85.DOI: 10.1016/j.jmst.2025.10.055

• Research article • Previous Articles     Next Articles

Effect of cerium addition on intergranular embrittlement behavior of GH3535 alloy induced by fission product tellurium

Jijin Wua,b, Fenfen Hana,*, Ruichen Duana,b, Xinyi Doua,c, Yanyan Jiaa, Jiamin Wanga, Hefei Huanga,*   

  1. aState Key Laboratory of Thorium Energy, Shanghai Institute of Applied Physics, Chinese Academy of Science, Shanghai 201800, China;
    bUniversity of Chinese Academy of Sciences, Beijing 100049, China;
    cSchool of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China
  • Received:2025-09-01 Revised:2025-10-27 Accepted:2025-10-27 Online:2026-08-19
  • Contact: *E-mail addresses: hanfenfen@sinap.ac.cn (F. Han), huanghefei@sinap.ac.cn (H. Huang).

Abstract: This study investigates the mechanism by which Ce content influences Te diffusion and grain boundary embrittlement in modified GH3535 alloy exposed to 800 °C in Te vapor. The results demonstrate that Ce significantly reduces Te diffusion depth and mitigates Te-induced intergranular cracking. The microstructure analysis reveals that Te diffusion was suppressed, primarily due to the formation of a surface telluride layer and the sequestration of Te atoms by Ce at grain boundaries. The alloy with 0.045 wt.% Ce exhibited optimal resistance to Te embrittlement. Excessive Ce addition promoted the formation of Ce-rich intermetallic compounds, which impaired mechanical properties and did not further improve resistance to Te diffusion. Thus, microalloying with Ce presents a promising strategy for alleviating Te-induced embrittlement in molten salt reactor materials.

Key words: Nickel-based alloys, Fission product, Te induced embrittlement, Ce addition