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Elemental partitioning of platinum group metal containing Ni-base superalloys using electron microprobe analysis and atom probe tomography / J.S. Van Sluytman in Acta materialia, Vol. 58 N° 6 (Avril 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 1952–1962 Titre : Elemental partitioning of platinum group metal containing Ni-base superalloys using electron microprobe analysis and atom probe tomography Type de document : texte imprimé Auteurs : J.S. Van Sluytman, Auteur ; A. La Fontaine, Auteur ; J. M. Cairney, Auteur Année de publication : 2011 Article en page(s) : pp. 1952–1962 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Platinum  group  metals  Elemental  partitioning  Electron  microprobe  analysis  Atom  probe  tomography  Nickel-base  superalloys Résumé : 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 γ–γ′ microstructures. Electron microprobe analysis was used to measure the composition of coarse γ′ particles. Selected alloys were studied using atom probe tomography. Pt and Ru weakly partition to the γ′ and γ 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 γ′ 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008179 [article] Elemental partitioning of platinum group metal containing Ni-base superalloys using electron microprobe analysis and atom probe tomography [texte imprimé] / J.S. Van Sluytman, Auteur ; A. La Fontaine, Auteur ; J. M. Cairney, Auteur . - 2011 . - pp. 1952–1962. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 6 (Avril 2010) . - pp. 1952–1962 Mots-clés : Platinum  group  metals  Elemental  partitioning  Electron  microprobe  analysis  Atom  probe  tomography  Nickel-base  superalloys Résumé : 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 γ–γ′ microstructures. Electron microprobe analysis was used to measure the composition of coarse γ′ particles. Selected alloys were studied using atom probe tomography. Pt and Ru weakly partition to the γ′ and γ 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 γ′ 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. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645409008179