Nanostructural temporal evolution and solute partitioning in model NI-based superalloys containing ruthenium, rhenium, and tungsten

Dieter Isheim; Gillian Hsieh; Ronald D. Noebe; David N. Seidman

Nanostructural temporal evolution and solute partitioning in model NI-based superalloys containing ruthenium, rhenium, and tungsten

Dieter Isheim^*, Gillian Hsieh, Ronald D. Noebe, David N. Seidman

^*Corresponding author for this work

Materials Science and Engineering

Research output: Contribution to conference › Paper › peer-review

10 Scopus citations

Abstract

Transmission electron microscopy (TEM) and atom-probe tomography (APT) are employed to study the growth and coarsening kinetics of γ'-precipitates and the solute partitioning behavior in a series of model superalloys based on a Ni-8.5Cr-10Al at.% composition with Ru, Ru-Re, or Ru-Re-W additions, during isothermal aging at 800°C up to 256 h. Substituting Ru for Ni is found to retard the growth and coarsening kinetics of the γ'-precipitates; Re and W additions decrease the coarsening rate constant further by an order of magnitude. The exponent of the temporal power law for the precipitate radius is n= (3.3 ± 0.1) and the time exponent for the number density is m = (-0. 82 ± 0.06) for all three alloys, independent of coherency strain energy differences between the three alloys. The aluminum concentration in the γ'-precipitates is found to decrease continuously with aging time, which is consistent with a nucleation and growth precipitation process.

Original language	English (US)
Pages	309-314
Number of pages	6
State	Published - Dec 1 2005
Event	International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 - Phoenix, AZ, United States Duration: May 29 2005 → Jun 3 2005

Other

Other	International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005
Country	United States
City	Phoenix, AZ
Period	5/29/05 → 6/3/05

Keywords

Atom-probe tomography
Coarsening
Nickel-based superalloy
Rhenium
Ruthenium
Transmission electron microscopy
Tungsten

ASJC Scopus subject areas

Engineering(all)

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title = "Nanostructural temporal evolution and solute partitioning in model NI-based superalloys containing ruthenium, rhenium, and tungsten",

abstract = "Transmission electron microscopy (TEM) and atom-probe tomography (APT) are employed to study the growth and coarsening kinetics of γ'-precipitates and the solute partitioning behavior in a series of model superalloys based on a Ni-8.5Cr-10Al at.% composition with Ru, Ru-Re, or Ru-Re-W additions, during isothermal aging at 800°C up to 256 h. Substituting Ru for Ni is found to retard the growth and coarsening kinetics of the γ'-precipitates; Re and W additions decrease the coarsening rate constant further by an order of magnitude. The exponent of the temporal power law for the precipitate radius is n= (3.3 ± 0.1) and the time exponent for the number density is m = (-0. 82 ± 0.06) for all three alloys, independent of coherency strain energy differences between the three alloys. The aluminum concentration in the γ'-precipitates is found to decrease continuously with aging time, which is consistent with a nucleation and growth precipitation process.",

keywords = "Atom-probe tomography, Coarsening, Nickel-based superalloy, Rhenium, Ruthenium, Transmission electron microscopy, Tungsten",

author = "Dieter Isheim and Gillian Hsieh and Noebe, {Ronald D.} and Seidman, {David N.}",

year = "2005",

month = dec,

day = "1",

language = "English (US)",

pages = "309--314",

note = "International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005 ; Conference date: 29-05-2005 Through 03-06-2005",

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Nanostructural temporal evolution and solute partitioning in model NI-based superalloys containing ruthenium, rhenium, and tungsten. / Isheim, Dieter; Hsieh, Gillian; Noebe, Ronald D.; Seidman, David N.

2005. 309-314 Paper presented at International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005, Phoenix, AZ, United States.

Research output: Contribution to conference › Paper › peer-review

TY - CONF

T1 - Nanostructural temporal evolution and solute partitioning in model NI-based superalloys containing ruthenium, rhenium, and tungsten

AU - Isheim, Dieter

AU - Hsieh, Gillian

AU - Noebe, Ronald D.

AU - Seidman, David N.

PY - 2005/12/1

Y1 - 2005/12/1

N2 - Transmission electron microscopy (TEM) and atom-probe tomography (APT) are employed to study the growth and coarsening kinetics of γ'-precipitates and the solute partitioning behavior in a series of model superalloys based on a Ni-8.5Cr-10Al at.% composition with Ru, Ru-Re, or Ru-Re-W additions, during isothermal aging at 800°C up to 256 h. Substituting Ru for Ni is found to retard the growth and coarsening kinetics of the γ'-precipitates; Re and W additions decrease the coarsening rate constant further by an order of magnitude. The exponent of the temporal power law for the precipitate radius is n= (3.3 ± 0.1) and the time exponent for the number density is m = (-0. 82 ± 0.06) for all three alloys, independent of coherency strain energy differences between the three alloys. The aluminum concentration in the γ'-precipitates is found to decrease continuously with aging time, which is consistent with a nucleation and growth precipitation process.

AB - Transmission electron microscopy (TEM) and atom-probe tomography (APT) are employed to study the growth and coarsening kinetics of γ'-precipitates and the solute partitioning behavior in a series of model superalloys based on a Ni-8.5Cr-10Al at.% composition with Ru, Ru-Re, or Ru-Re-W additions, during isothermal aging at 800°C up to 256 h. Substituting Ru for Ni is found to retard the growth and coarsening kinetics of the γ'-precipitates; Re and W additions decrease the coarsening rate constant further by an order of magnitude. The exponent of the temporal power law for the precipitate radius is n= (3.3 ± 0.1) and the time exponent for the number density is m = (-0. 82 ± 0.06) for all three alloys, independent of coherency strain energy differences between the three alloys. The aluminum concentration in the γ'-precipitates is found to decrease continuously with aging time, which is consistent with a nucleation and growth precipitation process.

KW - Atom-probe tomography

KW - Coarsening

KW - Nickel-based superalloy

KW - Rhenium

KW - Ruthenium

KW - Transmission electron microscopy

KW - Tungsten

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M3 - Paper

AN - SCOPUS:33645233990

SP - 309

EP - 314

T2 - International Conference on Solid-Solid Phase Transformations in Inorganic Materials 2005

Y2 - 29 May 2005 through 3 June 2005

ER -

Nanostructural temporal evolution and solute partitioning in model NI-based superalloys containing ruthenium, rhenium, and tungsten

Abstract

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Keywords

ASJC Scopus subject areas

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