Effects of tantalum on the temporal evolution of a model Ni-Al-Cr superalloy during phase decomposition

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

doi:10.1016/j.actamat.2008.10.029

Effects of tantalum on the temporal evolution of a model Ni-Al-Cr superalloy during phase decomposition

Christopher Booth-Morrison, Ronald D. Noebe, David N. Seidman^*

^*Corresponding author for this work

Materials Science and Engineering

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

69 Scopus citations

Abstract

The effects of a 2.0 at.% addition of Ta to a model Ni-10.0Al-8.5Cr (at.%) superalloy aged at 1073 K are assessed using scanning electron microscopy and atom-probe tomography. The γ′(L1₂)-precipitate morphology that develops as a result of γ-(fcc)matrix phase decomposition is found to evolve from a bimodal distribution of spheroidal precipitates, to {0 0 1}-faceted cuboids and parallelepipeds aligned along the elastically soft 〈0 0 1〉-type directions. The phase compositions and the widths of the γ′-precipitate/γ-matrix heterophase interfaces evolve temporally as the Ni-Al-Cr-Ta alloy undergoes quasi-stationary state coarsening after 1 h of aging. Tantalum is observed to partition preferentially to the γ′-precipitate phase, and suppresses the mobility of Ni in the γ-matrix sufficiently to cause an accumulation of Ni on the γ-matrix side of the γ′/γ interface. Additionally, computational modeling, employing Thermo-Calc, Dictra and PrecipiCalc, is employed to elucidate the kinetic pathways that lead to phase decomposition in this concentrated Ni-Al-Cr-Ta alloy.

Original language	English (US)
Pages (from-to)	909-920
Number of pages	12
Journal	Acta Materialia
Volume	57
Issue number	3
DOIs	https://doi.org/10.1016/j.actamat.2008.10.029
State	Published - Feb 2009

Keywords

Atom-probe tomography
Nanostructures
Nickel-based superalloys
Tantalum

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

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10.1016/j.actamat.2008.10.029

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@article{31188d248e174f9b95f3a47783cf3339,

title = "Effects of tantalum on the temporal evolution of a model Ni-Al-Cr superalloy during phase decomposition",

abstract = "The effects of a 2.0 at.% addition of Ta to a model Ni-10.0Al-8.5Cr (at.%) superalloy aged at 1073 K are assessed using scanning electron microscopy and atom-probe tomography. The γ′(L12)-precipitate morphology that develops as a result of γ-(fcc)matrix phase decomposition is found to evolve from a bimodal distribution of spheroidal precipitates, to {0 0 1}-faceted cuboids and parallelepipeds aligned along the elastically soft 〈0 0 1〉-type directions. The phase compositions and the widths of the γ′-precipitate/γ-matrix heterophase interfaces evolve temporally as the Ni-Al-Cr-Ta alloy undergoes quasi-stationary state coarsening after 1 h of aging. Tantalum is observed to partition preferentially to the γ′-precipitate phase, and suppresses the mobility of Ni in the γ-matrix sufficiently to cause an accumulation of Ni on the γ-matrix side of the γ′/γ interface. Additionally, computational modeling, employing Thermo-Calc, Dictra and PrecipiCalc, is employed to elucidate the kinetic pathways that lead to phase decomposition in this concentrated Ni-Al-Cr-Ta alloy.",

keywords = "Atom-probe tomography, Nanostructures, Nickel-based superalloys, Tantalum",

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

note = "Funding Information: This research was sponsored by the National Science Foundation (NSF) under grant DMR-080461. The SEM and TEM studies were performed in the EPIC facility of the NUANCE Center at Northwestern University. The NUANCE Center is supported by NSF-NSEC, NSF-MRSEC, the Keck Foundation, the State of Illinois and Northwestern University. Atom-probe tomographic measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). Research Assistant Professor D. Isheim is kindly thanked for managing NUCAPT. The LEAP {\textregistered} tomograph was purchased and upgraded with funding from the NSF-MRI (DMR 0420532) and ONR-DURIP (N00014-0400798 and N00014-0610539). We extend our gratitude to Dr. C. Campbell of the National Institute of Standards and Technology, Metallurgy Division (Gaithersburg, MD), for diffusivity calculations, to Dr. C.K. Sudbrack, Dr. K.E. Yoon and Dr. M. Nathal for discussions, and to Mr. Y. Zhou, Mr. M. Anderson and Dr. Y. Amouyal for their assistance with the APT, SEM and TEM work, respectively. We thank Prof. G.B. Olson and Dr. H.-J. Jou of QuesTek LLC (Evanston, IL) for use of PrecipiCalc.",

year = "2009",

month = feb,

doi = "10.1016/j.actamat.2008.10.029",

language = "English (US)",

volume = "57",

pages = "909--920",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier Limited",

number = "3",

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TY - JOUR

T1 - Effects of tantalum on the temporal evolution of a model Ni-Al-Cr superalloy during phase decomposition

AU - Booth-Morrison, Christopher

AU - Noebe, Ronald D.

AU - Seidman, David N.

N1 - Funding Information: This research was sponsored by the National Science Foundation (NSF) under grant DMR-080461. The SEM and TEM studies were performed in the EPIC facility of the NUANCE Center at Northwestern University. The NUANCE Center is supported by NSF-NSEC, NSF-MRSEC, the Keck Foundation, the State of Illinois and Northwestern University. Atom-probe tomographic measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT). Research Assistant Professor D. Isheim is kindly thanked for managing NUCAPT. The LEAP ® tomograph was purchased and upgraded with funding from the NSF-MRI (DMR 0420532) and ONR-DURIP (N00014-0400798 and N00014-0610539). We extend our gratitude to Dr. C. Campbell of the National Institute of Standards and Technology, Metallurgy Division (Gaithersburg, MD), for diffusivity calculations, to Dr. C.K. Sudbrack, Dr. K.E. Yoon and Dr. M. Nathal for discussions, and to Mr. Y. Zhou, Mr. M. Anderson and Dr. Y. Amouyal for their assistance with the APT, SEM and TEM work, respectively. We thank Prof. G.B. Olson and Dr. H.-J. Jou of QuesTek LLC (Evanston, IL) for use of PrecipiCalc.

PY - 2009/2

Y1 - 2009/2

N2 - The effects of a 2.0 at.% addition of Ta to a model Ni-10.0Al-8.5Cr (at.%) superalloy aged at 1073 K are assessed using scanning electron microscopy and atom-probe tomography. The γ′(L12)-precipitate morphology that develops as a result of γ-(fcc)matrix phase decomposition is found to evolve from a bimodal distribution of spheroidal precipitates, to {0 0 1}-faceted cuboids and parallelepipeds aligned along the elastically soft 〈0 0 1〉-type directions. The phase compositions and the widths of the γ′-precipitate/γ-matrix heterophase interfaces evolve temporally as the Ni-Al-Cr-Ta alloy undergoes quasi-stationary state coarsening after 1 h of aging. Tantalum is observed to partition preferentially to the γ′-precipitate phase, and suppresses the mobility of Ni in the γ-matrix sufficiently to cause an accumulation of Ni on the γ-matrix side of the γ′/γ interface. Additionally, computational modeling, employing Thermo-Calc, Dictra and PrecipiCalc, is employed to elucidate the kinetic pathways that lead to phase decomposition in this concentrated Ni-Al-Cr-Ta alloy.

AB - The effects of a 2.0 at.% addition of Ta to a model Ni-10.0Al-8.5Cr (at.%) superalloy aged at 1073 K are assessed using scanning electron microscopy and atom-probe tomography. The γ′(L12)-precipitate morphology that develops as a result of γ-(fcc)matrix phase decomposition is found to evolve from a bimodal distribution of spheroidal precipitates, to {0 0 1}-faceted cuboids and parallelepipeds aligned along the elastically soft 〈0 0 1〉-type directions. The phase compositions and the widths of the γ′-precipitate/γ-matrix heterophase interfaces evolve temporally as the Ni-Al-Cr-Ta alloy undergoes quasi-stationary state coarsening after 1 h of aging. Tantalum is observed to partition preferentially to the γ′-precipitate phase, and suppresses the mobility of Ni in the γ-matrix sufficiently to cause an accumulation of Ni on the γ-matrix side of the γ′/γ interface. Additionally, computational modeling, employing Thermo-Calc, Dictra and PrecipiCalc, is employed to elucidate the kinetic pathways that lead to phase decomposition in this concentrated Ni-Al-Cr-Ta alloy.

KW - Atom-probe tomography

KW - Nanostructures

KW - Nickel-based superalloys

KW - Tantalum

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AN - SCOPUS:58049195568

SN - 1359-6454

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JO - Acta Materialia

JF - Acta Materialia

IS - 3

ER -

Effects of tantalum on the temporal evolution of a model Ni-Al-Cr superalloy during phase decomposition

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Keywords

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