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The Influence of Tungsten on the Chemical Composition of a Temporally Evolving Nanostructure of a Model Ni-Al-Cr Superalloy

Published online by Cambridge University Press:  01 June 2004

Chantal K. Sudbrack ,
Dieter Isheim ,
Ronald D. Noebe ,
Nathan S. Jacobson  and
David N. Seidman
Chantal K. Sudbrack
Affiliation:
Department of Materials Science & Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
Dieter Isheim
Affiliation:
Department of Materials Science & Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
Ronald D. Noebe
Affiliation:
NASA Glenn Research Center, Cleveland, OH 44135, USA
Nathan S. Jacobson
Affiliation:
NASA Glenn Research Center, Cleveland, OH 44135, USA
David N. Seidman
Affiliation:
Department of Materials Science & Engineering, Northwestern University, 2220 Campus Drive, Evanston, IL 60208-3108, USA
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Abstract

The influence of W on the temporal evolution of γ′ precipitation toward equilibrium in a model Ni-Al-Cr alloy is investigated by three-dimensional atom-probe (3DAP) microscopy and transmission electron microscopy (TEM). We report on the alloys Ni-10 Al-8.5 Cr (at.%) and Ni-10 Al-8.5 Cr-2 W (at.%), which were aged isothermally in the γ + γ′ two-phase field at 1073 K, for times ranging from 0.25 to 264 h. Spheroidal-shaped γ′ precipitates, 5–15 nm diameter, form during quenching from above the solvus temperature in both alloys at a high number density (∼1023 m−3). As γ′ precipitates grow with aging at 1073 K, a transition from spheriodal- to cuboidal-shaped precipitates is observed in both alloys. The elemental partitioning and spatially resolved concentration profiles across the γ′ precipitates are obtained as a function of aging time from three-dimensional atom-by-atom reconstructions. Proximity histogram concentration profiles (Hellman et al., 2000) of the quaternary alloy demonstrate that W concentration gradients exist in γ′ precipitates in the as-quenched and 0.25-h aging states, which disappear after 1 h of aging. The diffusion coefficient of W in γ′ is estimated to be 6.2 × 10−20 m2 s−1 at 1073 K. The W addition decreases the coarsening rate constant, and leads to stronger partitioning of Al to γ′ and Cr to γ.

Keywords

nickel-base superalloythree-dimensional atom-probe microscopytungstenaluminumchromiumtemporal evolutiondecompositioncoarseningnanostructurepartitioning ratioproxigram
Type
Research Article
Information
Microscopy and Microanalysis , Volume 10 , Issue 3 , June 2004 , pp. 355 - 365
Copyright
© 2004 Microscopy Society of America

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