The partitioning behavior of W in a multicomponent Ni-based superalloy and in a ternary Ni–Al–W alloy is investigated using atom-probe tomography (APT) and first-principles calculations. APT observations indicate that whereas W partitions preferentially to the -precipitates in the ternary alloy, its partitioning behavior is reversed in favor of the -matrix in the multicomponent alloy. First-principles calculations of the substitutional formation energies of W and Ta predict that Ta has a larger driving force for partitioning to the phase than W. This implies that Ta displaces W from the -precipitates into the -matrix in multicomponent alloys.
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