The morphologies of (001) γ/γ′ interfacial dislocation networks were studied by means of transmission electron microscopy. This fourth-generation superalloy possessed superior creep properties due to its fine interfacial dislocation networks. These networks were characterized by closely-spaced dislocations and by a stable square morphology during creep deformation. Such arrangements could effectively prevent slipping dislocations, in the γ-phase, from moving through the γ/γ′ interface.

The Influence of Interfacial Dislocation Arrangements in a Fourth Generation Single Crystal TMS-138 Superalloy on Creep Properties. J.X.Zhang, T.Murakumo, Y.Koizumi, H.Harada: Journal of Materials Science, 2003, 38[24], 4883-8