On the nanometer scale phase separation of a low-supersaturation Ni-Al-Cr alloy

Christopher Booth-Morrison; Yang Zhou; Ronald D. Noebe; David N. Seidman

doi:10.1080/14786430902806660

On the nanometer scale phase separation of a low-supersaturation Ni-Al-Cr alloy

Christopher Booth-Morrison, Yang Zhou, Ronald D. Noebe, David N. Seidman

Materials Science and Engineering

Research output: Contribution to journal › Article › peer-review

38 Scopus citations

Abstract

The phase separation of a Ni-6.5 Al-9.5 Cr at. % alloy aged at 873 K was studied by atom-probe tomography and compared to the predictions of classical precipitation models. Phase separation in this alloy occurs in four distinct regimes: (i) quasi-stationary-state γ'(L1₂)-precipitate nucleation; (ii) concomitant precipitate nucleation, growth and coagulation and coalescence; (iii) concurrent growth and coarsening, wherein coarsening occurs via both γ'-precipitate coagulation and coalescence and by the classical evaporation-condensation mechanism; and (iv) quasi-stationary-state coarsening of γ'-precipitates, once the equilibrium volume fraction of precipitates is achieved. The predictions of classical nucleation and growth models are not validated experimentally, likely due to the complexity of the atomistic kinetic pathways involved in precipitation. During coarsening, the temporal evolution of the γ'-precipitate average radius, number density and the γ(fcc)-matrix and γ'-precipitate supersaturations follow the predictions of classical models.

Original language	English (US)
Pages (from-to)	219-235
Number of pages	17
Journal	Philosophical Magazine
Volume	90
Issue number	1-4
DOIs	https://doi.org/10.1080/14786430902806660
State	Published - Jan 2010

Funding

This research was sponsored by the National Science Foundation under grant DMR-080461, Dr. H. Chopra, grant officer. APT measurements were performed at the Northwestern University Center for Atom Probe Tomography (NUCAPT). The LEAP tomograph was purchased and upgraded with funding from the NSF-MRI (DMR 0420532, Dr. C. Bouldin, grant officer) and ONR-DURIP (N00014-0400798 and N00014-0610539, Dr. J. Christodoulou, grant officer). We extend our gratitude to Dr. C. Campbell of the National Institute of Standards and Technology, Metallurgy Division, (Gaithersburg, MD) for diffusivity calculations and to Dr. D. Isheim for managing NUCAPT, and for discussions of our results. We thank Prof G. B. Olson and Dr. H.-J. Jou of QuesTek LLC (Evanston, IL) for use of PrecipiCalc.

Keywords

Atom probe tomography
Nanostructure
Nickel-based superalloy
Phase decomposition
Temporal evolution

ASJC Scopus subject areas

Condensed Matter Physics

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10.1080/14786430902806660

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title = "On the nanometer scale phase separation of a low-supersaturation Ni-Al-Cr alloy",

abstract = "The phase separation of a Ni-6.5 Al-9.5 Cr at. % alloy aged at 873 K was studied by atom-probe tomography and compared to the predictions of classical precipitation models. Phase separation in this alloy occurs in four distinct regimes: (i) quasi-stationary-state γ'(L12)-precipitate nucleation; (ii) concomitant precipitate nucleation, growth and coagulation and coalescence; (iii) concurrent growth and coarsening, wherein coarsening occurs via both γ'-precipitate coagulation and coalescence and by the classical evaporation-condensation mechanism; and (iv) quasi-stationary-state coarsening of γ'-precipitates, once the equilibrium volume fraction of precipitates is achieved. The predictions of classical nucleation and growth models are not validated experimentally, likely due to the complexity of the atomistic kinetic pathways involved in precipitation. During coarsening, the temporal evolution of the γ'-precipitate average radius, number density and the γ(fcc)-matrix and γ'-precipitate supersaturations follow the predictions of classical models.",

keywords = "Atom probe tomography, Nanostructure, Nickel-based superalloy, Phase decomposition, Temporal evolution",

author = "Christopher Booth-Morrison and Yang Zhou and Noebe, {Ronald D.} and Seidman, {David N.}",

note = "Funding Information: This research was sponsored by the National Science Foundation under grant DMR-080461, Dr. H. Chopra, grant officer. APT measurements were performed at the Northwestern University Center for Atom Probe Tomography (NUCAPT). The LEAP tomograph was purchased and upgraded with funding from the NSF-MRI (DMR 0420532, Dr. C. Bouldin, grant officer) and ONR-DURIP (N00014-0400798 and N00014-0610539, Dr. J. Christodoulou, grant officer). We extend our gratitude to Dr. C. Campbell of the National Institute of Standards and Technology, Metallurgy Division, (Gaithersburg, MD) for diffusivity calculations and to Dr. D. Isheim for managing NUCAPT, and for discussions of our results. We thank Prof G. B. Olson and Dr. H.-J. Jou of QuesTek LLC (Evanston, IL) for use of PrecipiCalc.",

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AU - Zhou, Yang

AU - Noebe, Ronald D.

AU - Seidman, David N.

N1 - Funding Information: This research was sponsored by the National Science Foundation under grant DMR-080461, Dr. H. Chopra, grant officer. APT measurements were performed at the Northwestern University Center for Atom Probe Tomography (NUCAPT). The LEAP tomograph was purchased and upgraded with funding from the NSF-MRI (DMR 0420532, Dr. C. Bouldin, grant officer) and ONR-DURIP (N00014-0400798 and N00014-0610539, Dr. J. Christodoulou, grant officer). We extend our gratitude to Dr. C. Campbell of the National Institute of Standards and Technology, Metallurgy Division, (Gaithersburg, MD) for diffusivity calculations and to Dr. D. Isheim for managing NUCAPT, and for discussions of our results. We thank Prof G. B. Olson and Dr. H.-J. Jou of QuesTek LLC (Evanston, IL) for use of PrecipiCalc.

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N2 - The phase separation of a Ni-6.5 Al-9.5 Cr at. % alloy aged at 873 K was studied by atom-probe tomography and compared to the predictions of classical precipitation models. Phase separation in this alloy occurs in four distinct regimes: (i) quasi-stationary-state γ'(L12)-precipitate nucleation; (ii) concomitant precipitate nucleation, growth and coagulation and coalescence; (iii) concurrent growth and coarsening, wherein coarsening occurs via both γ'-precipitate coagulation and coalescence and by the classical evaporation-condensation mechanism; and (iv) quasi-stationary-state coarsening of γ'-precipitates, once the equilibrium volume fraction of precipitates is achieved. The predictions of classical nucleation and growth models are not validated experimentally, likely due to the complexity of the atomistic kinetic pathways involved in precipitation. During coarsening, the temporal evolution of the γ'-precipitate average radius, number density and the γ(fcc)-matrix and γ'-precipitate supersaturations follow the predictions of classical models.

AB - The phase separation of a Ni-6.5 Al-9.5 Cr at. % alloy aged at 873 K was studied by atom-probe tomography and compared to the predictions of classical precipitation models. Phase separation in this alloy occurs in four distinct regimes: (i) quasi-stationary-state γ'(L12)-precipitate nucleation; (ii) concomitant precipitate nucleation, growth and coagulation and coalescence; (iii) concurrent growth and coarsening, wherein coarsening occurs via both γ'-precipitate coagulation and coalescence and by the classical evaporation-condensation mechanism; and (iv) quasi-stationary-state coarsening of γ'-precipitates, once the equilibrium volume fraction of precipitates is achieved. The predictions of classical nucleation and growth models are not validated experimentally, likely due to the complexity of the atomistic kinetic pathways involved in precipitation. During coarsening, the temporal evolution of the γ'-precipitate average radius, number density and the γ(fcc)-matrix and γ'-precipitate supersaturations follow the predictions of classical models.

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KW - Nickel-based superalloy

KW - Phase decomposition

KW - Temporal evolution

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JF - Philosophical Magazine

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ER -

On the nanometer scale phase separation of a low-supersaturation Ni-Al-Cr alloy

Abstract

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Keywords

ASJC Scopus subject areas

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