Temporal evolution of sub-nanometer compositional profiles across the γ/γ' interface in a model Ni-Al-Cr superalloy

Chantal K. Sudbrack; Ronald D. Noebe; David N. Seidman

Temporal evolution of sub-nanometer compositional profiles across the γ/γ' interface in a model Ni-Al-Cr superalloy

Chantal K. Sudbrack^*, Ronald D. Noebe, David N. Seidman

^*Corresponding author for this work

Materials Science and Engineering

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

7 Scopus citations

Abstract

Early-stage phase separation in a Ni-5.2 Al-14.2 Cr at.% superalloy, isothermally decomposing at 873 K, is investigated with atom-probe tomography. Sub-nanometer scale compositional profiles across the γ/γ'(L1 ₂) interfaces demonstrate that both the γ-matrix and the γ'-precipitate compositions evolve with time. Observed chemical gradients of Al depletion and Cr enrichment adjacent to the γ'-precipitates are transient, consistent with well-established model predictions for diffusion-limited growth, and mark the first detailed observation of this phenomenon. Furthermore, it is shown that Cr atoms are kinetically trapped in the growing precipitates.

Original language	English (US)
Pages	543-548
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/Territory	United States
City	Phoenix, AZ
Period	5/29/05 → 6/3/05

Keywords

Diffusion-limited growth
Interface composition
Nanostructure
Nickel alloys

ASJC Scopus subject areas

Engineering(all)

Cite this

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title = "Temporal evolution of sub-nanometer compositional profiles across the γ/γ' interface in a model Ni-Al-Cr superalloy",

abstract = "Early-stage phase separation in a Ni-5.2 Al-14.2 Cr at.% superalloy, isothermally decomposing at 873 K, is investigated with atom-probe tomography. Sub-nanometer scale compositional profiles across the γ/γ'(L1 2) interfaces demonstrate that both the γ-matrix and the γ'-precipitate compositions evolve with time. Observed chemical gradients of Al depletion and Cr enrichment adjacent to the γ'-precipitates are transient, consistent with well-established model predictions for diffusion-limited growth, and mark the first detailed observation of this phenomenon. Furthermore, it is shown that Cr atoms are kinetically trapped in the growing precipitates.",

keywords = "Diffusion-limited growth, Interface composition, Nanostructure, Nickel alloys",

author = "Sudbrack, {Chantal K.} and Noebe, {Ronald D.} and Seidman, {David N.}",

year = "2005",

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Temporal evolution of sub-nanometer compositional profiles across the γ/γ' interface in a model Ni-Al-Cr superalloy. / Sudbrack, Chantal K.; Noebe, Ronald D.; Seidman, David N.
2005. 543-548 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 - Temporal evolution of sub-nanometer compositional profiles across the γ/γ' interface in a model Ni-Al-Cr superalloy

AU - Sudbrack, Chantal K.

AU - Noebe, Ronald D.

AU - Seidman, David N.

PY - 2005/12/1

Y1 - 2005/12/1

N2 - Early-stage phase separation in a Ni-5.2 Al-14.2 Cr at.% superalloy, isothermally decomposing at 873 K, is investigated with atom-probe tomography. Sub-nanometer scale compositional profiles across the γ/γ'(L1 2) interfaces demonstrate that both the γ-matrix and the γ'-precipitate compositions evolve with time. Observed chemical gradients of Al depletion and Cr enrichment adjacent to the γ'-precipitates are transient, consistent with well-established model predictions for diffusion-limited growth, and mark the first detailed observation of this phenomenon. Furthermore, it is shown that Cr atoms are kinetically trapped in the growing precipitates.

AB - Early-stage phase separation in a Ni-5.2 Al-14.2 Cr at.% superalloy, isothermally decomposing at 873 K, is investigated with atom-probe tomography. Sub-nanometer scale compositional profiles across the γ/γ'(L1 2) interfaces demonstrate that both the γ-matrix and the γ'-precipitate compositions evolve with time. Observed chemical gradients of Al depletion and Cr enrichment adjacent to the γ'-precipitates are transient, consistent with well-established model predictions for diffusion-limited growth, and mark the first detailed observation of this phenomenon. Furthermore, it is shown that Cr atoms are kinetically trapped in the growing precipitates.

KW - Diffusion-limited growth

KW - Interface composition

KW - Nanostructure

KW - Nickel alloys

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M3 - Paper

AN - SCOPUS:33645216153

SP - 543

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

Y2 - 29 May 2005 through 3 June 2005

ER -

Temporal evolution of sub-nanometer compositional profiles across the γ/γ' interface in a model Ni-Al-Cr superalloy

Abstract

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Keywords

ASJC Scopus subject areas

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