Segregation of tungsten at γ′ (L 12) /γ (fcc) interfaces in a Ni-based superalloy: An atom-probe tomographic and first-principles study

Yaron Amouyal; Zugang Mao; David N. Seidman

doi:10.1063/1.3026745

Segregation of tungsten at γ′ (L 12) /γ (fcc) interfaces in a Ni-based superalloy: An atom-probe tomographic and first-principles study

Yaron Amouyal, Zugang Mao, David N. Seidman

Materials Science and Engineering

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

43 Scopus citations

Abstract

γ (fcc) / γ′ (L 12) heterophase interfaces in a Ni-based superalloy are investigated using atom-probe tomography and first-principles calculations. Flat {100} interfaces exhibit a confined (nonmonotonic) Gibbsian interfacial excess of tungsten, ΓW =1.2±0.2 nm-2, corresponding to a 5 mJ m-2 decrease in interfacial free energy. Conversely, no measurable segregation of W is detected at curved interfaces. First-principles calculations for a Ni-Al-W system having a {100} interface indicate a decrease in the interfacial energy of 5 mJ m-2 due to W segregation. Similar calculations for {110} and {111} interfaces predict an increase of 1 and 9 mJ m-2 in their energies, respectively, and therefore no heterophase segregation.

Original language	English (US)
Article number	201905
Journal	Applied Physics Letters
Volume	93
Issue number	20
DOIs	https://doi.org/10.1063/1.3026745
State	Published - 2008

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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title = "Segregation of tungsten at γ′ (L 12) /γ (fcc) interfaces in a Ni-based superalloy: An atom-probe tomographic and first-principles study",

abstract = "γ (fcc) / γ′ (L 12) heterophase interfaces in a Ni-based superalloy are investigated using atom-probe tomography and first-principles calculations. Flat {100} interfaces exhibit a confined (nonmonotonic) Gibbsian interfacial excess of tungsten, ΓW =1.2±0.2 nm-2, corresponding to a 5 mJ m-2 decrease in interfacial free energy. Conversely, no measurable segregation of W is detected at curved interfaces. First-principles calculations for a Ni-Al-W system having a {100} interface indicate a decrease in the interfacial energy of 5 mJ m-2 due to W segregation. Similar calculations for {110} and {111} interfaces predict an increase of 1 and 9 mJ m-2 in their energies, respectively, and therefore no heterophase segregation.",

author = "Yaron Amouyal and Zugang Mao and Seidman, {David N.}",

note = "Funding Information: The research was implemented in support of MEANS II AFOSR under Grant No. FA9550-05-1-0089. Y.A. wishes to acknowledge the Marie Curie IOF (CEC FP7). Dr. L. Graham and Professor T. Pollock are kindly thanked for supplying alloys. The LEAP tomograph was purchased with funding from the NSF-MRI and ONR-DURIP programs. The authors wish to acknowledge Dr. D. Isheim for managing the Northwestern University Center for Atom-Probe Tomography (NUCAPT), and Mr. C. Booth-Morrison and Dr. J. Wu (EPIC) of Northwestern University for helpful discussions.",

year = "2008",

doi = "10.1063/1.3026745",

language = "English (US)",

volume = "93",

journal = "Applied Physics Letters",

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T1 - Segregation of tungsten at γ′ (L 12) /γ (fcc) interfaces in a Ni-based superalloy

T2 - An atom-probe tomographic and first-principles study

AU - Amouyal, Yaron

AU - Mao, Zugang

AU - Seidman, David N.

N1 - Funding Information: The research was implemented in support of MEANS II AFOSR under Grant No. FA9550-05-1-0089. Y.A. wishes to acknowledge the Marie Curie IOF (CEC FP7). Dr. L. Graham and Professor T. Pollock are kindly thanked for supplying alloys. The LEAP tomograph was purchased with funding from the NSF-MRI and ONR-DURIP programs. The authors wish to acknowledge Dr. D. Isheim for managing the Northwestern University Center for Atom-Probe Tomography (NUCAPT), and Mr. C. Booth-Morrison and Dr. J. Wu (EPIC) of Northwestern University for helpful discussions.

PY - 2008

Y1 - 2008

N2 - γ (fcc) / γ′ (L 12) heterophase interfaces in a Ni-based superalloy are investigated using atom-probe tomography and first-principles calculations. Flat {100} interfaces exhibit a confined (nonmonotonic) Gibbsian interfacial excess of tungsten, ΓW =1.2±0.2 nm-2, corresponding to a 5 mJ m-2 decrease in interfacial free energy. Conversely, no measurable segregation of W is detected at curved interfaces. First-principles calculations for a Ni-Al-W system having a {100} interface indicate a decrease in the interfacial energy of 5 mJ m-2 due to W segregation. Similar calculations for {110} and {111} interfaces predict an increase of 1 and 9 mJ m-2 in their energies, respectively, and therefore no heterophase segregation.

AB - γ (fcc) / γ′ (L 12) heterophase interfaces in a Ni-based superalloy are investigated using atom-probe tomography and first-principles calculations. Flat {100} interfaces exhibit a confined (nonmonotonic) Gibbsian interfacial excess of tungsten, ΓW =1.2±0.2 nm-2, corresponding to a 5 mJ m-2 decrease in interfacial free energy. Conversely, no measurable segregation of W is detected at curved interfaces. First-principles calculations for a Ni-Al-W system having a {100} interface indicate a decrease in the interfacial energy of 5 mJ m-2 due to W segregation. Similar calculations for {110} and {111} interfaces predict an increase of 1 and 9 mJ m-2 in their energies, respectively, and therefore no heterophase segregation.

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Segregation of tungsten at γ′ (L 12) /γ (fcc) interfaces in a Ni-based superalloy: An atom-probe tomographic and first-principles study

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