Temporal evolution of the nanostructure of Al(Sc,Zr) alloys: Part i - Chemical compositions of Al3(Sc1-xZrx) precipitates

Christian B. Fuller; Joanne L. Murray; David N. Seidman

doi:10.1016/j.actamat.2005.08.016

Temporal evolution of the nanostructure of Al(Sc,Zr) alloys: Part i - Chemical compositions of Al₃(Sc_1-xZr_x) precipitates

Christian B. Fuller, Joanne L. Murray, David N. Seidman^*

^*Corresponding author for this work

Materials Science and Engineering

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

248 Scopus citations

Abstract

Atom-probe tomography (APT) and high-resolution transmission electron microscopy are used to study the chemical composition and nanostructural temporal evolution of Al₃(Sc_1-xZr_x) precipitates in an Al-0.09 Sc-0.047 Zr at.% alloy aged at 300 °C. Concentration profiles, via APT, reveal that Sc and Zr partition to Al ₃(Sc_1-xZr_x) precipitates and Zr segregates concomitantly to the α-Al/Al₃(Sc_1-xZr_x) interface. The Zr concentration in the precipitates increases with increasing aging time, reaching a maximum value of 1.5 at.% at 576 h. The relative Gibbsian interfacial excess (ΓZrAl-Sc) of Zr, with respect to Al and Sc, reaches a maximum value of 1.24 ± 0.62 atoms nm^-2 after 2412 h. The temporal evolution of Al₃(Sc_1-xZr_x) precipitates is determined by measuring the time dependence of the depletion of the matrix supersaturation of Sc and Zr. The time dependency of the supersaturation of Zr does not follow the asymptotic t^-1/3 law while that of Sc does, indicating that a quasi-stationary state is not achieved for both Sc and Zr.

Original language	English (US)
Pages (from-to)	5401-5413
Number of pages	13
Journal	Acta Materialia
Volume	53
Issue number	20
DOIs	https://doi.org/10.1016/j.actamat.2005.08.016
State	Published - Dec 2005

Keywords

Al-Sc-Zr alloys
High-resolution electron microscopy
Microstructure
Precipitation
Three-dimensional atom-probe microscopy

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Polymers and Plastics
Metals and Alloys

Access to Document

10.1016/j.actamat.2005.08.016

Cite this

@article{6a66701606a54e98b496588c7a6ba4e4,

title = "Temporal evolution of the nanostructure of Al(Sc,Zr) alloys: Part i - Chemical compositions of Al3(Sc1-xZrx) precipitates",

abstract = "Atom-probe tomography (APT) and high-resolution transmission electron microscopy are used to study the chemical composition and nanostructural temporal evolution of Al3(Sc1-xZrx) precipitates in an Al-0.09 Sc-0.047 Zr at.% alloy aged at 300 °C. Concentration profiles, via APT, reveal that Sc and Zr partition to Al 3(Sc1-xZrx) precipitates and Zr segregates concomitantly to the α-Al/Al3(Sc1-xZrx) interface. The Zr concentration in the precipitates increases with increasing aging time, reaching a maximum value of 1.5 at.% at 576 h. The relative Gibbsian interfacial excess (ΓZrAl-Sc) of Zr, with respect to Al and Sc, reaches a maximum value of 1.24 ± 0.62 atoms nm-2 after 2412 h. The temporal evolution of Al3(Sc1-xZrx) precipitates is determined by measuring the time dependence of the depletion of the matrix supersaturation of Sc and Zr. The time dependency of the supersaturation of Zr does not follow the asymptotic t-1/3 law while that of Sc does, indicating that a quasi-stationary state is not achieved for both Sc and Zr.",

keywords = "Al-Sc-Zr alloys, High-resolution electron microscopy, Microstructure, Precipitation, Three-dimensional atom-probe microscopy",

author = "Fuller, {Christian B.} and Murray, {Joanne L.} and Seidman, {David N.}",

note = "Funding Information: This research was supported by the United States Department of Energy, Basic Energy Sciences Division, under contract DE-FG02-98ER45721. We thank David C. Dunand, Peter W. Voorhees, Alexander Umantsev, Emmanuelle A. Marquis, Dieter Isheim, Jens Alkemper, and Jason T. Sebastian for discussions and Olof Hellman for continuous development of ADAM, now named APEX. Special thanks are due to Argonne National Laboratory and especially Dr. Roseann Csencsits for use of the JEOL 4000EXII. We also thank Ashurst Inc. for supplying the Al–Sc master alloy and Robert W. Hyland, Jr. and Alcoa Inc. for supplying the Al–Sc and Al–Zr master alloys and for useful discussions.",

year = "2005",

month = dec,

doi = "10.1016/j.actamat.2005.08.016",

language = "English (US)",

volume = "53",

pages = "5401--5413",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier Limited",

number = "20",

}

TY - JOUR

T1 - Temporal evolution of the nanostructure of Al(Sc,Zr) alloys

T2 - Part i - Chemical compositions of Al3(Sc1-xZrx) precipitates

AU - Fuller, Christian B.

AU - Murray, Joanne L.

AU - Seidman, David N.

N1 - Funding Information: This research was supported by the United States Department of Energy, Basic Energy Sciences Division, under contract DE-FG02-98ER45721. We thank David C. Dunand, Peter W. Voorhees, Alexander Umantsev, Emmanuelle A. Marquis, Dieter Isheim, Jens Alkemper, and Jason T. Sebastian for discussions and Olof Hellman for continuous development of ADAM, now named APEX. Special thanks are due to Argonne National Laboratory and especially Dr. Roseann Csencsits for use of the JEOL 4000EXII. We also thank Ashurst Inc. for supplying the Al–Sc master alloy and Robert W. Hyland, Jr. and Alcoa Inc. for supplying the Al–Sc and Al–Zr master alloys and for useful discussions.

PY - 2005/12

Y1 - 2005/12

N2 - Atom-probe tomography (APT) and high-resolution transmission electron microscopy are used to study the chemical composition and nanostructural temporal evolution of Al3(Sc1-xZrx) precipitates in an Al-0.09 Sc-0.047 Zr at.% alloy aged at 300 °C. Concentration profiles, via APT, reveal that Sc and Zr partition to Al 3(Sc1-xZrx) precipitates and Zr segregates concomitantly to the α-Al/Al3(Sc1-xZrx) interface. The Zr concentration in the precipitates increases with increasing aging time, reaching a maximum value of 1.5 at.% at 576 h. The relative Gibbsian interfacial excess (ΓZrAl-Sc) of Zr, with respect to Al and Sc, reaches a maximum value of 1.24 ± 0.62 atoms nm-2 after 2412 h. The temporal evolution of Al3(Sc1-xZrx) precipitates is determined by measuring the time dependence of the depletion of the matrix supersaturation of Sc and Zr. The time dependency of the supersaturation of Zr does not follow the asymptotic t-1/3 law while that of Sc does, indicating that a quasi-stationary state is not achieved for both Sc and Zr.

AB - Atom-probe tomography (APT) and high-resolution transmission electron microscopy are used to study the chemical composition and nanostructural temporal evolution of Al3(Sc1-xZrx) precipitates in an Al-0.09 Sc-0.047 Zr at.% alloy aged at 300 °C. Concentration profiles, via APT, reveal that Sc and Zr partition to Al 3(Sc1-xZrx) precipitates and Zr segregates concomitantly to the α-Al/Al3(Sc1-xZrx) interface. The Zr concentration in the precipitates increases with increasing aging time, reaching a maximum value of 1.5 at.% at 576 h. The relative Gibbsian interfacial excess (ΓZrAl-Sc) of Zr, with respect to Al and Sc, reaches a maximum value of 1.24 ± 0.62 atoms nm-2 after 2412 h. The temporal evolution of Al3(Sc1-xZrx) precipitates is determined by measuring the time dependence of the depletion of the matrix supersaturation of Sc and Zr. The time dependency of the supersaturation of Zr does not follow the asymptotic t-1/3 law while that of Sc does, indicating that a quasi-stationary state is not achieved for both Sc and Zr.

KW - Al-Sc-Zr alloys

KW - High-resolution electron microscopy

KW - Microstructure

KW - Precipitation

KW - Three-dimensional atom-probe microscopy

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