Spinodal Decomposition Mechanism of γ′ Precipitation in a Single Crystal Ni-Based Superalloy

X.P. Tan (1) , Dominique Mangelinck (1) , Carine Perrin-Pellegrino (1) , Luc Rougier (2) , Charles-André Gandin (3) , Alain Jacot (2) , Damien Ponsen (4) , Virginie Jaquet (4)

1 IM2NP - Institut des Matériaux, de Microélectronique et des Nanosciences de Provence
2 STI IMX LSMX
3 CEMEF - Centre de Mise en Forme des Matériaux
4 Service YQGC

The precipitation of γ′ phase in a commercial single crystal Ni-based superalloy with different cooling rates has been investigated by atom probe tomography. Numerous irregular interconnected γ′ precipitates in the size range of ~30 to 50 nm were obtained even utilizing the fastest possible cooling rate. Diffuse γ/γ′ interface and far from equilibrium composition of γ′ phase were observed in the fast-cooled sample, suggesting that γ′ precipitation occurs via a spinodal decomposition at the very early stage.

Mots clés: Metallic Materials; Characterization and Evaluation of Materials; Structural Materials; Surfaces and Interfaces; Thin Films; Nanotechnology

Domaines: Sciences de l'ingénieur [physics]; Matériaux

X.P. Tan, Dominique Mangelinck, Carine Perrin-Pellegrino, Luc Rougier, Charles-André Gandin, et al.. Spinodal Decomposition Mechanism of γ′ Precipitation in a Single Crystal Ni-Based Superalloy. Metallurgical and Materials Transactions A, 2014, 45 (11), pp.4725-4730. ⟨10.1007/s11661-014-2506-8⟩. ⟨hal-01058164⟩