Abstract
The partitioning behaviors and alloying effect of Re and Ru in Co-based superalloys are investigated by first-principles calculations with γ ( Co ) / γ ′ ( Co 3 ( Al , W ) ) interface model. Both elements are observed to partition more into the γ-Co phase and the Ru addition decreases the γ phase partitioning trend of Re. Re prefers the substitution at W sublattice site while Ru prefers face-center Co sublattice site of the γ ′ -Co 3(Al, W) (L1 2) phase.
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