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Elemental partitioning of platinum group metal containing Ni-base superalloys using electron microprobe analysis and atom probe tomography by J.S. Van Sluytman; A. La Fontaine; J.M. Cairney; T.M. Pollock is a Engineering article available to read on EtoBox.

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The partitioning of platinum group metal (PGM) additions in polycrystalline Ni-base superalloys has been investigated. Alloys with a baseline composition of 15Al-5Cr-1Re-2Ta-0.1Hf (at.%) with systematic variations in Pt, Ir, Ru and W were cast and heat-treated to produce bimodal two-phase c-c 0 microstructures. Electron microprobe analysis was used to measure the composition of coarse c 0 particles. Selected alloys were studied using atom probe tomography. Pt and Ru weakly partition to the c 0 and c phases, respectively, whereas Ir partitions equally between both phases. Pt and Ru do not change partitioning behavior appreciably with additional W and Re. Interestingly, Ir lowers c 0 volume fraction and reduces partitioning of W, Re, Ru, Al and Pt. Tungsten partitioning coefficients exhibit an unusually strong temperature dependence, with increased partitioning of W to the matrix at lower temperatures. The thermodynamics of these PGM-containing systems are analyzed and the implications for partitioning are discussed.

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Author

J.S. Van Sluytman; A. La Fontaine; J.M. Cairney; T.M. Pollock

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 1359-6454)

Published

2010

Language

EN

Field

Engineering (Physical Sciences)