Coarsening kinetics of nanoscale Al3Sc precipitates in an Al-Mg-Sc alloy

Emmanuelle A. Marquis; David N. Seidman

doi:10.1016/j.actamat.2005.05.025

Coarsening kinetics of nanoscale Al₃Sc precipitates in an Al-Mg-Sc alloy

Emmanuelle A. Marquis, David N. Seidman^*

^*Corresponding author for this work

Materials Science and Engineering

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

138 Scopus citations

Abstract

The effects of Mg alloying on the temporal evolution of Al₃Sc (L1₂ structure) nanoscale precipitates are investigated, focusing on the morphology and coarsening kinetics of Al₃Sc precipitates in an Al-2.2 Mg-0.12 Sc at.% alloy aged between 300 and 400 °C. Approximately spheroidal precipitates are obtained after aging at 300 °C and irregular morphologies are observed at 400 °C. The coarsening behavior is studied using conventional and high-resolution transmission electron microscopies to obtain the temporal evolution of the precipitate radius, and atom-probe tomography is employed to measure the Sc concentration in the α-matrix. The coarsening kinetics are analyzed using a coarsening model developed by Kuehmann and Voorhees for ternary systems [Kuehmann CJ, Voorhees PW. Metall Mater Trans A 1996;27:937]. Values of the interfacial free energy and diffusion coefficient for Sc diffusion in this Al-Mg-Sc alloy at 300 °C are independently calculated, and are in good agreement with the calculated value of interfacial free energy [Asta M, Ozolins V, Woodward C. JOM 2001;53:16] and the experimental diffusivity obtained for the Al-Sc system [Marquis EA, Seidman DN. Acta Mater 2001;49:1909; Marquis EA. Ph.D. Thesis. Materials Science and Engineering Department, Northwestern University, 2002; Fujikawa SI. Defect Diffusion Forum 1997;143-147:115].

Original language	English (US)
Pages (from-to)	4259-4268
Number of pages	10
Journal	Acta Materialia
Volume	53
Issue number	15
DOIs	https://doi.org/10.1016/j.actamat.2005.05.025
State	Published - Sep 2005

Keywords

AlSc precipitate
Atom-probe tomography
Coarsening
Morphology
Transmission electron 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.2005.05.025

Cite this

@article{77b113262e36406c8c7bdf0b1cfb5c25,

title = "Coarsening kinetics of nanoscale Al3Sc precipitates in an Al-Mg-Sc alloy",

abstract = "The effects of Mg alloying on the temporal evolution of Al3Sc (L12 structure) nanoscale precipitates are investigated, focusing on the morphology and coarsening kinetics of Al3Sc precipitates in an Al-2.2 Mg-0.12 Sc at.% alloy aged between 300 and 400 °C. Approximately spheroidal precipitates are obtained after aging at 300 °C and irregular morphologies are observed at 400 °C. The coarsening behavior is studied using conventional and high-resolution transmission electron microscopies to obtain the temporal evolution of the precipitate radius, and atom-probe tomography is employed to measure the Sc concentration in the α-matrix. The coarsening kinetics are analyzed using a coarsening model developed by Kuehmann and Voorhees for ternary systems [Kuehmann CJ, Voorhees PW. Metall Mater Trans A 1996;27:937]. Values of the interfacial free energy and diffusion coefficient for Sc diffusion in this Al-Mg-Sc alloy at 300 °C are independently calculated, and are in good agreement with the calculated value of interfacial free energy [Asta M, Ozolins V, Woodward C. JOM 2001;53:16] and the experimental diffusivity obtained for the Al-Sc system [Marquis EA, Seidman DN. Acta Mater 2001;49:1909; Marquis EA. Ph.D. Thesis. Materials Science and Engineering Department, Northwestern University, 2002; Fujikawa SI. Defect Diffusion Forum 1997;143-147:115].",

keywords = "AlSc precipitate, Atom-probe tomography, Coarsening, Morphology, Transmission electron microscopy",

author = "Marquis, {Emmanuelle A.} and Seidman, {David N.}",

note = "Funding Information: This research is supported by the United States Department of Energy, Basic Sciences Division, under contract DE-FG02-98ER45721. The authors acknowledge Professors Mark D. Asta, David C. Dunand, and Peter W. Voorhees (Northwestern University) and Alexander Umantsev for interesting discussions, Dr. Joanne L. Murray (Alcoa) for kindly providing data on the Al–Mg–Sc phase diagram ( Fig. 1 ), Dr. Roseanne Csencsits, formerly of Argonne National Laboratory, for use of the JEOL 4000EXII microscope at Argonne National Laboratory, and Alcoa Inc. and Ashurst Inc. for kindly supplying Al–Sc master alloys. ",

year = "2005",

month = sep,

doi = "10.1016/j.actamat.2005.05.025",

language = "English (US)",

volume = "53",

pages = "4259--4268",

journal = "Acta Materialia",

issn = "1359-6454",

publisher = "Elsevier Limited",

number = "15",

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TY - JOUR

T1 - Coarsening kinetics of nanoscale Al3Sc precipitates in an Al-Mg-Sc alloy

AU - Marquis, Emmanuelle A.

AU - Seidman, David N.

N1 - Funding Information: This research is supported by the United States Department of Energy, Basic Sciences Division, under contract DE-FG02-98ER45721. The authors acknowledge Professors Mark D. Asta, David C. Dunand, and Peter W. Voorhees (Northwestern University) and Alexander Umantsev for interesting discussions, Dr. Joanne L. Murray (Alcoa) for kindly providing data on the Al–Mg–Sc phase diagram ( Fig. 1 ), Dr. Roseanne Csencsits, formerly of Argonne National Laboratory, for use of the JEOL 4000EXII microscope at Argonne National Laboratory, and Alcoa Inc. and Ashurst Inc. for kindly supplying Al–Sc master alloys.

PY - 2005/9

Y1 - 2005/9

N2 - The effects of Mg alloying on the temporal evolution of Al3Sc (L12 structure) nanoscale precipitates are investigated, focusing on the morphology and coarsening kinetics of Al3Sc precipitates in an Al-2.2 Mg-0.12 Sc at.% alloy aged between 300 and 400 °C. Approximately spheroidal precipitates are obtained after aging at 300 °C and irregular morphologies are observed at 400 °C. The coarsening behavior is studied using conventional and high-resolution transmission electron microscopies to obtain the temporal evolution of the precipitate radius, and atom-probe tomography is employed to measure the Sc concentration in the α-matrix. The coarsening kinetics are analyzed using a coarsening model developed by Kuehmann and Voorhees for ternary systems [Kuehmann CJ, Voorhees PW. Metall Mater Trans A 1996;27:937]. Values of the interfacial free energy and diffusion coefficient for Sc diffusion in this Al-Mg-Sc alloy at 300 °C are independently calculated, and are in good agreement with the calculated value of interfacial free energy [Asta M, Ozolins V, Woodward C. JOM 2001;53:16] and the experimental diffusivity obtained for the Al-Sc system [Marquis EA, Seidman DN. Acta Mater 2001;49:1909; Marquis EA. Ph.D. Thesis. Materials Science and Engineering Department, Northwestern University, 2002; Fujikawa SI. Defect Diffusion Forum 1997;143-147:115].

AB - The effects of Mg alloying on the temporal evolution of Al3Sc (L12 structure) nanoscale precipitates are investigated, focusing on the morphology and coarsening kinetics of Al3Sc precipitates in an Al-2.2 Mg-0.12 Sc at.% alloy aged between 300 and 400 °C. Approximately spheroidal precipitates are obtained after aging at 300 °C and irregular morphologies are observed at 400 °C. The coarsening behavior is studied using conventional and high-resolution transmission electron microscopies to obtain the temporal evolution of the precipitate radius, and atom-probe tomography is employed to measure the Sc concentration in the α-matrix. The coarsening kinetics are analyzed using a coarsening model developed by Kuehmann and Voorhees for ternary systems [Kuehmann CJ, Voorhees PW. Metall Mater Trans A 1996;27:937]. Values of the interfacial free energy and diffusion coefficient for Sc diffusion in this Al-Mg-Sc alloy at 300 °C are independently calculated, and are in good agreement with the calculated value of interfacial free energy [Asta M, Ozolins V, Woodward C. JOM 2001;53:16] and the experimental diffusivity obtained for the Al-Sc system [Marquis EA, Seidman DN. Acta Mater 2001;49:1909; Marquis EA. Ph.D. Thesis. Materials Science and Engineering Department, Northwestern University, 2002; Fujikawa SI. Defect Diffusion Forum 1997;143-147:115].

KW - AlSc precipitate

KW - Atom-probe tomography

KW - Coarsening

KW - Morphology

KW - Transmission electron microscopy

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SN - 1359-6454

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