Investigating the Dislocation-Driven Micro-mechanical Response Under Non-isothermal Creep Conditions in Single-Crystal Superalloys

C. Schwalbe , J. Cormier (1) , C. Jones , E. Galindo-Nava , C. Rae (2)

1 ENDO - ENDOmmagement et durabilité [Institut Pprime]
2 CAM - University of Cambridge [UK]

The creep responses of the superalloy CMSX-4 under thermal cycling conditions (900 °C to 1050 °C) and constant load (σ0=200MPa) were analyzed using TEM dislocation analysis and compared to the modeled evolution of key creep parameters. By studying tests interrupted at different stages of creep, it is argued that the thermal cycling creep rate under these conditions depends on the creation of interfacial dislocation networks and their disintegration by the γ′-shear of dissimilar Burgers vector pairs.

Domaines: Mécanique des fluides [physics.class-ph]; Matériaux et structures en mécanique [physics.class-ph]; Physique Quantique [quant-ph]; Acoustique [physics.class-ph]; Biomécanique [physics.med-ph]; Matériaux; Polymères; Acoustique [physics.class-ph]; Automatique / Robotique; Electromagnétisme; Milieux fluides et réactifs; Energie électrique; Thermique [physics.class-ph]; Vibrations [physics.class-ph]; Physique mathématique [math-ph]

C. Schwalbe, J. Cormier, C. Jones, E. Galindo-Nava, C. Rae. Investigating the Dislocation-Driven Micro-mechanical Response Under Non-isothermal Creep Conditions in Single-Crystal Superalloys. Metallurgical and Materials Transactions A, 2018, 49 (9), pp.3988-4002. ⟨10.1007/s11661-018-4764-3⟩. ⟨hal-02291749⟩