Determination of the gamma prime/gamma interface width in a Co-Al-W alloy via coupled aberration-corrected scanning transmission electron microscopy and atom probe tomography

S. Meher; G. B. Viswanathan; S. Nag; H. L. Fraser; R. Banerjee

doi:10.1016/j.scriptamat.2016.04.037

Determination of the gamma prime/gamma interface width in a Co-Al-W alloy via coupled aberration-corrected scanning transmission electron microscopy and atom probe tomography

S. Meher, G. B. Viswanathan, S. Nag, H. L. Fraser, R. Banerjee

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

12 Scopus citations

Abstract

The compositional and order-disorder transition widths of γ′/γ interfaces in a Co-Al-W alloy have been established for the first time by coupling of aberration corrected high resolution scanning transmission electron microscopy and orientation-specific atom probe tomography. While the compositional width is approximately 2.5 nm, the order-disorder transition width is very sharp measuring 0.5 nm. A comparative study revealed that the γ′/γ interfaces, in a model Ni-Al-Cr alloy, are both compositionally and structurally diffuse with nearly the same width (~ 2.5-3 nm). These differences between the γ′/γ interfaces in Co and Ni-base alloys can impact the coarsening behavior of the ordered precipitates.

Original language	English
Pages (from-to)	23-27
Number of pages	5
Journal	Scripta Materialia
Volume	121
DOIs	https://doi.org/10.1016/j.scriptamat.2016.04.037
State	Published - Aug 1 2016
Externally published	Yes

Funding

The authors would like to acknowledge the U.S. Air Force Research Laboratory (AFRL contract FA8650-08-C-5226 ) for providing financial support for the study. In addition, the authors also gratefully acknowledge the Center for Advanced Research and Technology (CART) at University of North Texas and the Center for Electron Microscopy and Spectroscopy (CEMAS) at the Ohio State University for providing access to the experimental facilities used for the study.

Funders	Funder number
Air Force Research Laboratory	FA8650-08-C-5226

Keywords

Atom probe tomography
HAADF-STEM
Interfaces
Superalloy

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10.1016/j.scriptamat.2016.04.037

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title = "Determination of the gamma prime/gamma interface width in a Co-Al-W alloy via coupled aberration-corrected scanning transmission electron microscopy and atom probe tomography",

abstract = "The compositional and order-disorder transition widths of γ′/γ interfaces in a Co-Al-W alloy have been established for the first time by coupling of aberration corrected high resolution scanning transmission electron microscopy and orientation-specific atom probe tomography. While the compositional width is approximately 2.5 nm, the order-disorder transition width is very sharp measuring 0.5 nm. A comparative study revealed that the γ′/γ interfaces, in a model Ni-Al-Cr alloy, are both compositionally and structurally diffuse with nearly the same width (~ 2.5-3 nm). These differences between the γ′/γ interfaces in Co and Ni-base alloys can impact the coarsening behavior of the ordered precipitates.",

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AU - Viswanathan, G. B.

AU - Nag, S.

AU - Fraser, H. L.

AU - Banerjee, R.

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AB - The compositional and order-disorder transition widths of γ′/γ interfaces in a Co-Al-W alloy have been established for the first time by coupling of aberration corrected high resolution scanning transmission electron microscopy and orientation-specific atom probe tomography. While the compositional width is approximately 2.5 nm, the order-disorder transition width is very sharp measuring 0.5 nm. A comparative study revealed that the γ′/γ interfaces, in a model Ni-Al-Cr alloy, are both compositionally and structurally diffuse with nearly the same width (~ 2.5-3 nm). These differences between the γ′/γ interfaces in Co and Ni-base alloys can impact the coarsening behavior of the ordered precipitates.

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Determination of the gamma prime/gamma interface width in a Co-Al-W alloy via coupled aberration-corrected scanning transmission electron microscopy and atom probe tomography

Abstract

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Keywords

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