Evolution of interfacial dislocation network during anisothermal high-temperature creep of a nickel-based superalloy

Muriel Hantcherli (1) , Florence Pettinari-Sturmel (1) , Bernard Viguier (2) , Joël Douin (1) , Armand Coujou (1)

1 CEMES - Centre d'élaboration de matériaux et d'études structurales
2 CIRIMAT - Centre interuniversitaire de recherche et d'ingenierie des matériaux

The effect of thermal cycling creep on the dislocation networks at the γ/γ′ interfaces in the MC2 superalloy is investigated. Tensile creep tests were performed under thermal cycling and isothermal conditions at low stress (80 MPa) and high temperature (1150 °C). In these conditions γ′ rafts may dissolve and reprecipitate during thermal cycling creep. The difference between the effects of isothermal and thermal cycling conditions on the γ/γ′ interface dislocation networks, characterized by transmission electron microscopy, is exposed, as well as their evolution during the cycle.

Mots clés: MC2; Single-crystal superalloy; TEM; Interfacial dislocations; Thermal cycling creep

Domaines: Cristallographie; Matériaux; Science des matériaux [cond-mat.mtrl-sci]

Muriel Hantcherli, Florence Pettinari-Sturmel, Bernard Viguier, Joël Douin, Armand Coujou. Evolution of interfacial dislocation network during anisothermal high-temperature creep of a nickel-based superalloy. Scripta Materialia, 2011, vol. 66, pp. 143-146. ⟨10.1016/j.scriptamat.2011.10.022⟩. ⟨hal-00812030⟩