Abstract
The microstructure of a Ru-containing single crystal nickel-based superalloy, which is a potential fourth generation single crystal nickel-based superalloy heat treated, has been investi- gated. The X-ray diffraction (XRD) results indicate that this single crystal superalloy is not a perfect monocrystal, which is comprised of many subgrains with an average neighboring misorientation differ- ence about 0.5 ◦ and the maximum misorientation deviation about 3 ◦ ; and each subgrain includes large numbers of mosaic structures with misorientation difference of 0.1 ◦ —0.2 ◦ between each other. It is found that the microstructure of the heat treated alloy is of heterogeneity, where the volume fraction of γ � phase increases and the γ/γ � lattice misfit decreases. It is shown that the average size of γ � phase is 0.39 μm, the average γ � volume fraction 70% and the average γ/γ � lattice misfit -2.0×10 −3 .T he
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