Effect of orientation on the microstructure of nickel-based crystalline superalloys

The effect of crystal orientation on the microstructure of a nickel-based crystalline superalloys during directional solidification was explored. Differently oriented crystals with [001] and [011] orientations were fabricated with seeding technique. The results showed that primary dendrite arm spacings decreased simultaneously with the increase of misroientation. The primary dendrites arrange in lines in [011] single crystal. For [001] oriented crystals, the size of γ' phase increased with the increasing of misorientation. However, it was observed that the size of γ decreased with large misorientation for [011] orientated growth. Meanwhile, more γ' in [011] crystals tended to be triangular.