New Phases in a Multicomponent High Ruthenium Single Crystal Superalloy
Three unusual Ru-rich phases have been identified in a multicomponent Ni-base single crystal superalloy, including a L21 Ru2AlTa Heusler phase, a B2 RuAl phase and a hcp Re(Ru)-rich δ phase. These phases have their own preferential precipitation location within the dendritic structure. No conventional topologically-close-packed (TCP) phases have been observed with thermal exposure at 950oC for 1500 hours.
Z.Y. Zhong, H. Saka, T.H. Kim, E.A. Holm, Y.F. Han and X.S. Xie
Q. Feng et al., "New Phases in a Multicomponent High Ruthenium Single Crystal Superalloy", Materials Science Forum, Vols. 475-479, pp. 655-660, 2005