Elemental partitioning of platinum group metal containing Ni-base superalloys using electron microprobe analysis and atom probe tomography

被引：64

作者：

Van Sluytman, J. S. ^{[1
]}

La Fontaine, A. ^{[2
]}

Cairney, J. M. ^{[2
]}

Pollock, T. M. ^{[1
]}

机构：

[1] Univ Michigan, Dept Mat Sci & Engn, Ann Arbor, MI 48109 USA

[2] Univ Sydney, Electron Microscope Unit, Sydney, NSW 2006, Australia

来源：

ACTA MATERIALIA | 2010年 / 58卷 / 06期

关键词：

Platinum group metals; Elemental partitioning; Electron microprobe analysis; Atom probe tomography; Nickel-base superalloys; SINGLE-CRYSTAL SUPERALLOYS; CYCLIC-OXIDATION BEHAVIOR; RHENIUM ADDITIONS; PHASE-EQUILIBRIA; CREEP RESISTANCE; GAMMA'-PHASE; MICROSTRUCTURE; RU; RE; STABILITY;

D O I：

10.1016/j.actamat.2009.11.038

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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-0.1 Hf (at.%) with systematic variations in Pt, Ir, Ru and W were cast and heat-treated to produce bimodal two-phase gamma-gamma' microstructures. Electron microprobe analysis was used to measure the composition of coarse gamma' particles. Selected alloys were studied using atom probe tomography. Pt and Ru weakly partition to the gamma' and gamma 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 gamma' 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. (C) 2010 Published by Elsevier Ltd. on behalf of Acta Materialia Inc.

引用

页码：1952 / 1962

页数：11

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