Gleeble-3800 thermal simulation testing machine was used to perform hot compression tests on a novel Co-Ni-based superalloy to study its hot deformation behavior and microstructure evolution at deformation temperature of 950-1100 ℃,strain rate of 0.01-10 s-1 and true strain of 0.693.The results show that the flow stress of the alloy decreases with the increase of deformation temperature or the decrease of strain rate.The average grain size of the alloy increases with the increase of deformation temperature and the dynamic recrystallization grains can be refined by reducing the deformation temperature and increasing the strain rate.The EBSD and TEM analysis results indicate that the discontinuous dynamic recrystallization(DDRX)is the main dynamic recrystallization(DRX)mechanism and the twin nucleation is the auxiliary nucleation mechanism during the hot deformation of the alloy.
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