Driven by the pressing need for higher engine efficiency, extensive research has been dedicated towards discovering new materials with higher temperature capacity. Recently, a novel type of polycrystalline g/g’-d eutectic Ni-base superalloy has been demonstrated to have promising mechanical properties at elevated temperature, making it suitable to be utilized in the rotating and static components of turbine engines, where the temperature might exceed 800 °C. Careful grain size control of this g/g’-d eutectic alloys during thermo-mechanical processing is of critical importance if the very best yield stress, ductility and fatigue resistance is desired. A fundamental understanding of the dynamic recrystallization behavior of this type of composite material is thus required. In this poster, the dependence of grain size and microstructure on temperature, strain, and strain rate is systematically studied. An optimized set of hot forging parameters is determined, followed by a brief discussion on the underlying mechanism.