Atom probe tomography of secondary γ′ precipitation in a single crystal Ni-based superalloy after isothermal aging at 1100 °c

X.P. Tan (1) , Dominique Mangelinck (1) , C. 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

Secondary γ′ precipitation in a commercial single crystal Ni-based superalloy after the 1100 °C isothermal aging has been investigated by atom probe tomography. After the isothermal aging for 300 s, 1800 s and 3600 s, a bimodal size distribution of larger primary γ′ precipitates and numerous smaller secondary γ′ precipitates was obtained. It is proposed that the secondary γ′ precipitated via a non-classical nucleation mode. The coarsening of secondary γ′ precipitates well obeys the classical LSW theory.

Mots clés: High-temperature alloys; Atom probe tomography; Precipitation; Composition fluctuations

Domaines: Matériaux

X.P. Tan, Dominique Mangelinck, C. Perrin-Pellegrino, Luc Rougier, Charles-André Gandin, et al.. Atom probe tomography of secondary γ′ precipitation in a single crystal Ni-based superalloy after isothermal aging at 1100 °c. Journal of Alloys and Compounds, 2014, 611, pp.389-394. ⟨10.1016/j.jallcom.2014.05.132⟩. ⟨hal-01022688⟩