There was an important relation between the γ/γ' interfacial dislocations and the minimum creep rate. During creep (1100C, 137MPa), the finer the interfacial dislocation networks were, the smaller the minimum creep rate was. This was attributed to the interaction between the γ/γ' interfacial dislocations and slip dislocations in the γ matrix.

Dependence of Creep Strength on the Interfacial Dislocations in a Fourth Generation SC Superalloy TMS-138. J.X.Zhang, T.Murakumo, H.Harada, Y.Koizumi: Scripta Materialia, 2003, 48[3], 287-93