Effects of rhenium addition on the temporal evolution of the nanostructure and chemistry of a model Ni-Cr-Al superalloy. I: Experimental observations

Kevin E. Yoon; Ronald D. Noebe; David N. Seidman

doi:10.1016/j.actamat.2006.08.027

Effects of rhenium addition on the temporal evolution of the nanostructure and chemistry of a model Ni-Cr-Al superalloy. I: Experimental observations

Kevin E. Yoon, Ronald D. Noebe, David N. Seidman^*

^*Corresponding author for this work

Materials Science and Engineering

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

96 Scopus citations

Abstract

The temporal evolution of the nanostructure and chemistry of a model Ni-8.5 at.% Cr-10 at.% Al alloy, with the addition of 2 at.% Re, aged at 1073 K from 0.25 to 264 h, was studied. Transmission electron microscopy and atom-probe tomography were used to measure the number density and mean radius of the γ′ (L1₂ structure)-precipitates and the chemistry of the γ′-precipitates and the γ (face-centered cubic)-matrix, including the partitioning behavior of all alloying elements between the γ- and γ′-phases and the segregation behavior at γ/γ′ interfaces. The precipitates remained spheroidal for an aging time of up to 264 h and, unlike commercial nickel-based superalloys containing Re, there was not confined (nonmonotonic) Re segregation at the γ/γ′ interfaces.

Original language	English (US)
Pages (from-to)	1145-1157
Number of pages	13
Journal	Acta Materialia
Volume	55
Issue number	4
DOIs	https://doi.org/10.1016/j.actamat.2006.08.027
State	Published - Feb 2007

Funding

The National Science Foundation, Division of Materials Research sponsored this research under grant DMR-0241928. K. E. Yoon received partial support from a National Aeronautics and Space Administration Graduate Student Researcher Program fellowship. Special thanks to A. Panzanella (National Aeronautics and Space Administration Glenn Center) for electro-discharge machining all the APT sample blanks and to Drs. A. Umantsev and C. K. Sudbrack for reading the manuscript.

Keywords

Atom probe tomography
Nanostructure
Nickel alloys
Rhenium
Segregation

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.2006.08.027

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abstract = "The temporal evolution of the nanostructure and chemistry of a model Ni-8.5 at.% Cr-10 at.% Al alloy, with the addition of 2 at.% Re, aged at 1073 K from 0.25 to 264 h, was studied. Transmission electron microscopy and atom-probe tomography were used to measure the number density and mean radius of the γ′ (L12 structure)-precipitates and the chemistry of the γ′-precipitates and the γ (face-centered cubic)-matrix, including the partitioning behavior of all alloying elements between the γ- and γ′-phases and the segregation behavior at γ/γ′ interfaces. The precipitates remained spheroidal for an aging time of up to 264 h and, unlike commercial nickel-based superalloys containing Re, there was not confined (nonmonotonic) Re segregation at the γ/γ′ interfaces.",

keywords = "Atom probe tomography, Nanostructure, Nickel alloys, Rhenium, Segregation",

author = "Yoon, {Kevin E.} and Noebe, {Ronald D.} and Seidman, {David N.}",

note = "Funding Information: The National Science Foundation, Division of Materials Research sponsored this research under grant DMR-0241928. K. E. Yoon received partial support from a National Aeronautics and Space Administration Graduate Student Researcher Program fellowship. Special thanks to A. Panzanella (National Aeronautics and Space Administration Glenn Center) for electro-discharge machining all the APT sample blanks and to Drs. A. Umantsev and C. K. Sudbrack for reading the manuscript. ",

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AU - Seidman, David N.

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N2 - The temporal evolution of the nanostructure and chemistry of a model Ni-8.5 at.% Cr-10 at.% Al alloy, with the addition of 2 at.% Re, aged at 1073 K from 0.25 to 264 h, was studied. Transmission electron microscopy and atom-probe tomography were used to measure the number density and mean radius of the γ′ (L12 structure)-precipitates and the chemistry of the γ′-precipitates and the γ (face-centered cubic)-matrix, including the partitioning behavior of all alloying elements between the γ- and γ′-phases and the segregation behavior at γ/γ′ interfaces. The precipitates remained spheroidal for an aging time of up to 264 h and, unlike commercial nickel-based superalloys containing Re, there was not confined (nonmonotonic) Re segregation at the γ/γ′ interfaces.

AB - The temporal evolution of the nanostructure and chemistry of a model Ni-8.5 at.% Cr-10 at.% Al alloy, with the addition of 2 at.% Re, aged at 1073 K from 0.25 to 264 h, was studied. Transmission electron microscopy and atom-probe tomography were used to measure the number density and mean radius of the γ′ (L12 structure)-precipitates and the chemistry of the γ′-precipitates and the γ (face-centered cubic)-matrix, including the partitioning behavior of all alloying elements between the γ- and γ′-phases and the segregation behavior at γ/γ′ interfaces. The precipitates remained spheroidal for an aging time of up to 264 h and, unlike commercial nickel-based superalloys containing Re, there was not confined (nonmonotonic) Re segregation at the γ/γ′ interfaces.

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KW - Nickel alloys

KW - Rhenium

KW - Segregation

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Effects of rhenium addition on the temporal evolution of the nanostructure and chemistry of a model Ni-Cr-Al superalloy. I: Experimental observations

Abstract

Funding

Keywords

ASJC Scopus subject areas

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