Homogenizing effects of Co on multi-scale elemental distribution in Ru-containing Ni-based single crystal superalloys

The effects of Co on multi-scale elemental distributions were studied in an advanced Ru-containing Ni-based single crystal superalloys. Two types scales of microstructural heterogeneities, the large-scale dendritic segre-gations and small-scale elemental partitions between gamma/gamma' phase were compared in as-cast, heat-treated and thermal-exposed alloys. The elemental homogeneities on both large and small scale were shown to be enhanced with Co additions, giving rise to the restricted precipitation of TCP phase. It is thus expected the potential role of Co to replace part of Ru in advanced superalloys.

Automated summary

The effects of Co on multi-scale elemental distributions were investigated in advanced Ru-containing Ni-based single crystal superalloys. The study compared the microstructural heterogeneities on two scales, large-scale dendritic segregations and small-scale elemental partitions between gamma/gamma' phases, in different alloy conditions. The results showed that the addition of Co enhanced both large and small-scale elemental homogeneities and limited the precipitation of a specific phase. This suggests the potential of Co to replace part of Ru in advanced superalloys.