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The effect of thermal cycling creep on the dislocation networks at the c/c 0 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 c 0 rafts may dissolve and reprecipitate during thermal cycling creep. The difference between the effects of isothermal and thermal cycling conditions on the c/c 0 interface dislocation networks, characterized by transmission electron microscopy, is exposed, as well as their evolution during the cycle.

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