Unveiling the Re segregation at γ/γ′ interface in Ni-based superalloy

Jiachen Zhang, Taiwen Huang, Fan Lu, Kaili Cao, Dong Wang, Jian Zhang, Jun Zhang, Hai Jun Su, Lin Liu

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摘要

The distribution of Re in a Ni-based single crystal superalloy is specified by atom probe tomography after different heat treatment. At higher temperatures (950-1100°C), the Re diffusivity in γ matrix is becoming smaller than the actual effective diffusion for γ΄ growth, during the subsequent cooling process and the interface migration, consequently Re atoms are insufficient to diffuse away and keep accumulating, leading to forming segregation at γ/γ′ interface. While at low temperatures (800-900°C), the Re diffusion is capable of balancing the effective diffusion for γ΄ growth. After introducing more alloys with different Re content and different aging temperatures, Re segregation is irrelevant to the Re content but highly temperature-dependent. These results provide a novel perspective on the comprehension of the Re effect on γ΄ growth in Ni-based superalloy and are valuable to both improving the γ/γ′ microstructure stability and designing high-performance superalloys.

源语言英语
文章编号114131
期刊Scripta Materialia
204
DOI
出版状态已出版 - 11月 2021

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