Evolution of nanoscale precipitates in Al microalloyed with Sc and Er

Richard A. Karnesky; David C. Dunand; David N. Seidman

doi:10.1016/j.actamat.2009.04.034

Evolution of nanoscale precipitates in Al microalloyed with Sc and Er

Richard A. Karnesky, David C. Dunand, David N. Seidman^*

^*Corresponding author for this work

Materials Science and Engineering

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

118 Scopus citations

Abstract

The coarsening kinetics of nanoscale, coherent Al₃ (Sc_{1 - x} Er_x) precipitates in α-Al during aging of a supersaturated Al-0.06 Sc-0.02 Er (at.%) alloy at 300 °C are studied using transmission electron microscopy and local-electrode atom-probe tomography. Erbium and Sc segregate at the precipitate core and shell, respectively. The matrix supersaturations of Er and Sc, as well as the mean precipitate radius and number density evolve in approximate agreement with coarsening models, allowing the determination of the matrix/precipitate interfacial free energy and solute diffusivities. At 300 °C, the α -Al / Al₃ (Sc_{1 - x} Er_x) interfacial free energy due to Sc is about twice as large as for α -Al / Al₃ Sc. The diffusivity of Er in the ternary alloy is about three orders of magnitude smaller than that of Er in binary Al-0.045 at.% Er and about two orders of magnitude smaller than the diffusivity of Sc in binary Al-Sc. The measured Sc diffusivity is consistent with the literature values.

Original language	English (US)
Pages (from-to)	4022-4031
Number of pages	10
Journal	Acta Materialia
Volume	57
Issue number	14
DOIs	https://doi.org/10.1016/j.actamat.2009.04.034
State	Published - Aug 2009

Keywords

Aluminum alloys
Coarsening
Precipitation
Rare-earth elements
Scandium

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.2009.04.034

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@article{4dc87e0278e949758778f3ba3b584b7b,

title = "Evolution of nanoscale precipitates in Al microalloyed with Sc and Er",

abstract = "The coarsening kinetics of nanoscale, coherent Al3 (Sc1 - x Erx) precipitates in α-Al during aging of a supersaturated Al-0.06 Sc-0.02 Er (at.%) alloy at 300 °C are studied using transmission electron microscopy and local-electrode atom-probe tomography. Erbium and Sc segregate at the precipitate core and shell, respectively. The matrix supersaturations of Er and Sc, as well as the mean precipitate radius and number density evolve in approximate agreement with coarsening models, allowing the determination of the matrix/precipitate interfacial free energy and solute diffusivities. At 300 °C, the α -Al / Al3 (Sc1 - x Erx) interfacial free energy due to Sc is about twice as large as for α -Al / Al3 Sc. The diffusivity of Er in the ternary alloy is about three orders of magnitude smaller than that of Er in binary Al-0.045 at.% Er and about two orders of magnitude smaller than the diffusivity of Sc in binary Al-Sc. The measured Sc diffusivity is consistent with the literature values.",

keywords = "Aluminum alloys, Coarsening, Precipitation, Rare-earth elements, Scandium",

author = "Karnesky, {Richard A.} and Dunand, {David C.} and Seidman, {David N.}",

note = "Funding Information: This research is supported by the US Department of Energy through grant DE–FG02–98ER45721. Atom-probe tomographic measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT), using a LEAP tomograph purchased with funding from the NSF-MRI (DMR–0420532, Dr. Charles Bouldin, monitor) and ONR-DURIP ( N00014 –0400798, Dr. Julie Christodoulou, monitor) programs. Dr. Dieter Isheim is thanked for managing NUCAPT. The authors thank Drs. Z. Mao and M. van Dalen, and Mr. C. Booth-Morrison (all of Northwestern University) for useful conversations. ",

year = "2009",

month = aug,

doi = "10.1016/j.actamat.2009.04.034",

language = "English (US)",

volume = "57",

pages = "4022--4031",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier Limited",

number = "14",

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TY - JOUR

T1 - Evolution of nanoscale precipitates in Al microalloyed with Sc and Er

AU - Karnesky, Richard A.

AU - Dunand, David C.

AU - Seidman, David N.

N1 - Funding Information: This research is supported by the US Department of Energy through grant DE–FG02–98ER45721. Atom-probe tomographic measurements were performed at the Northwestern University Center for Atom-Probe Tomography (NUCAPT), using a LEAP tomograph purchased with funding from the NSF-MRI (DMR–0420532, Dr. Charles Bouldin, monitor) and ONR-DURIP ( N00014 –0400798, Dr. Julie Christodoulou, monitor) programs. Dr. Dieter Isheim is thanked for managing NUCAPT. The authors thank Drs. Z. Mao and M. van Dalen, and Mr. C. Booth-Morrison (all of Northwestern University) for useful conversations.

PY - 2009/8

Y1 - 2009/8

N2 - The coarsening kinetics of nanoscale, coherent Al3 (Sc1 - x Erx) precipitates in α-Al during aging of a supersaturated Al-0.06 Sc-0.02 Er (at.%) alloy at 300 °C are studied using transmission electron microscopy and local-electrode atom-probe tomography. Erbium and Sc segregate at the precipitate core and shell, respectively. The matrix supersaturations of Er and Sc, as well as the mean precipitate radius and number density evolve in approximate agreement with coarsening models, allowing the determination of the matrix/precipitate interfacial free energy and solute diffusivities. At 300 °C, the α -Al / Al3 (Sc1 - x Erx) interfacial free energy due to Sc is about twice as large as for α -Al / Al3 Sc. The diffusivity of Er in the ternary alloy is about three orders of magnitude smaller than that of Er in binary Al-0.045 at.% Er and about two orders of magnitude smaller than the diffusivity of Sc in binary Al-Sc. The measured Sc diffusivity is consistent with the literature values.

AB - The coarsening kinetics of nanoscale, coherent Al3 (Sc1 - x Erx) precipitates in α-Al during aging of a supersaturated Al-0.06 Sc-0.02 Er (at.%) alloy at 300 °C are studied using transmission electron microscopy and local-electrode atom-probe tomography. Erbium and Sc segregate at the precipitate core and shell, respectively. The matrix supersaturations of Er and Sc, as well as the mean precipitate radius and number density evolve in approximate agreement with coarsening models, allowing the determination of the matrix/precipitate interfacial free energy and solute diffusivities. At 300 °C, the α -Al / Al3 (Sc1 - x Erx) interfacial free energy due to Sc is about twice as large as for α -Al / Al3 Sc. The diffusivity of Er in the ternary alloy is about three orders of magnitude smaller than that of Er in binary Al-0.045 at.% Er and about two orders of magnitude smaller than the diffusivity of Sc in binary Al-Sc. The measured Sc diffusivity is consistent with the literature values.

KW - Aluminum alloys

KW - Coarsening

KW - Precipitation

KW - Rare-earth elements

KW - Scandium

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DO - 10.1016/j.actamat.2009.04.034

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AN - SCOPUS:67650251987

SN - 1359-6454

VL - 57

SP - 4022

EP - 4031

JO - Acta Materialia

JF - Acta Materialia

IS - 14

ER -

Evolution of nanoscale precipitates in Al microalloyed with Sc and Er

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