Elsevier

Surface Science

Volume 246, Issues 1–3, 3 April 1991, Pages 323-328
Surface Science

APFIM/TEM characterization of solute partitioning in a model Ni-Mo-Al-Ta superalloy

https://doi.org/10.1016/0039-6028(91)90434-TGet rights and content

Abstract

A combined APFIM/TEM study of a model nickel-based Ni-Mo-Al-Ta superalloy has been performed to investigate the partitioning behaviour of Mo and Ta. Phase composition measurements on uncrept and failed creep-tested samples show that Mo partitions preferentially to the γ phase and Ta to the γ' phase. Composition profiles across γ' interfaces showed no evidence for Mo or Ta segregation, apparently ruling this out as the mechanism responsible for the enhanced creep life of this alloy. DO22-ordered platelet precipitates were observed adjacent to the γ' cuboidal precipitates. The presence of these DO22-ordered platelet precipitates would be an obstacle to dislocations and to the growth of the γ' precipitates and hence might explain the good creep properties of alloys of this composition.

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