Nanoscale structural evolution of Al3Sc precipitates in Al(Sc) alloys

E. A. Marquis; D. N. Seidman

doi:10.1016/S1359-6454(01)00116-1

Nanoscale structural evolution of Al₃Sc precipitates in Al(Sc) alloys

E. A. Marquis, D. N. Seidman^*

^*Corresponding author for this work

Materials Science and Engineering

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

554 Scopus citations

Abstract

Precipitation of the Al₃Sc (L1₂) phase in aluminum alloys, containing 0.1, 0.2 or 0.3 wt% Sc, is studied with conventional transmission and high-resolution (HREM) electron microscopies. The exact morphologies of the Al₃Sc precipitates were determined for the first time by HREM, in Al-0.1 wt% Sc and Al-0.3 wt% Sc alloys. The experimentally determined equilibrium shape of the Al₃Sc precipitates, at 300°C and 0.3 wt% Sc, has 26 facets, which are the 6 {100} (cube), 12 {110} (rhombic dodecahedron), and 8 {111} (octahedron) planes, a Great Rhombicuboctahedron. This equilibrium morphology had been predicted by first principles calculations of the pertinent interfacial energies. The coarsening kinetics obey the (time)^1/3 kinetic law of Lifshitz-Slyozov-Wagner theory and they yield an activation energy for diffusion, 164±9 kJ/mol, that is in agreement with the values obtained from tracer diffusion measurements of Sc in Al and first principles calculations, which implies diffusion-controlled coarsening.

Original language	English (US)
Pages (from-to)	1909-1919
Number of pages	11
Journal	Acta Materialia
Volume	49
Issue number	11
DOIs	https://doi.org/10.1016/S1359-6454(01)00116-1
State	Published - Jun 22 2001

Funding

This research is supported by the United States Department of Energy, Basic Sciences Division, under contract DE-FG02-98ER45721. We would like to thank Professors Mark D. Asta, David C. Dunand, and Peter W. Voorhees (Northwestern University) for interesting and useful discussions, Professor Asta for permission to quote his unpublished results, Dr Joanne L. Murray (Alcoa Research Laboratory) for telling us the correct name (Great Rhombicuboctahedron) for the observed morphology, Argonne National Laboratories and especially Dr Roseann Csencsits for use of the JEOL4000EXII. We would also like to thank Ashurst Inc. for supplying the Al–Sc master alloy, Dr Robert W. Hyland for useful discussions of the physical metallurgy of Al–Sc alloys, and Professor Alan J. Ardell for a preprint of his paper. Fig. 14 is courtesy of Professor Jong K. Lee.

Keywords

Aluminum
Microstructure
Phase transformations
Scandium
Transmission electron microscopy (TEM)

ASJC Scopus subject areas

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

Access to Document

10.1016/S1359-6454(01)00116-1

Cite this

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title = "Nanoscale structural evolution of Al3Sc precipitates in Al(Sc) alloys",

abstract = "Precipitation of the Al3Sc (L12) phase in aluminum alloys, containing 0.1, 0.2 or 0.3 wt% Sc, is studied with conventional transmission and high-resolution (HREM) electron microscopies. The exact morphologies of the Al3Sc precipitates were determined for the first time by HREM, in Al-0.1 wt% Sc and Al-0.3 wt% Sc alloys. The experimentally determined equilibrium shape of the Al3Sc precipitates, at 300°C and 0.3 wt% Sc, has 26 facets, which are the 6 {100} (cube), 12 {110} (rhombic dodecahedron), and 8 {111} (octahedron) planes, a Great Rhombicuboctahedron. This equilibrium morphology had been predicted by first principles calculations of the pertinent interfacial energies. The coarsening kinetics obey the (time)1/3 kinetic law of Lifshitz-Slyozov-Wagner theory and they yield an activation energy for diffusion, 164±9 kJ/mol, that is in agreement with the values obtained from tracer diffusion measurements of Sc in Al and first principles calculations, which implies diffusion-controlled coarsening.",

keywords = "Aluminum, Microstructure, Phase transformations, Scandium, Transmission electron microscopy (TEM)",

author = "Marquis, {E. A.} and Seidman, {D. N.}",

note = "Funding Information: This research is supported by the United States Department of Energy, Basic Sciences Division, under contract DE-FG02-98ER45721. We would like to thank Professors Mark D. Asta, David C. Dunand, and Peter W. Voorhees (Northwestern University) for interesting and useful discussions, Professor Asta for permission to quote his unpublished results, Dr Joanne L. Murray (Alcoa Research Laboratory) for telling us the correct name (Great Rhombicuboctahedron) for the observed morphology, Argonne National Laboratories and especially Dr Roseann Csencsits for use of the JEOL4000EXII. We would also like to thank Ashurst Inc. for supplying the Al–Sc master alloy, Dr Robert W. Hyland for useful discussions of the physical metallurgy of Al–Sc alloys, and Professor Alan J. Ardell for a preprint of his paper. Fig. 14 is courtesy of Professor Jong K. Lee. ",

year = "2001",

month = jun,

day = "22",

doi = "10.1016/S1359-6454(01)00116-1",

language = "English (US)",

volume = "49",

pages = "1909--1919",

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TY - JOUR

T1 - Nanoscale structural evolution of Al3Sc precipitates in Al(Sc) alloys

AU - Marquis, E. A.

AU - Seidman, D. N.

N1 - Funding Information: This research is supported by the United States Department of Energy, Basic Sciences Division, under contract DE-FG02-98ER45721. We would like to thank Professors Mark D. Asta, David C. Dunand, and Peter W. Voorhees (Northwestern University) for interesting and useful discussions, Professor Asta for permission to quote his unpublished results, Dr Joanne L. Murray (Alcoa Research Laboratory) for telling us the correct name (Great Rhombicuboctahedron) for the observed morphology, Argonne National Laboratories and especially Dr Roseann Csencsits for use of the JEOL4000EXII. We would also like to thank Ashurst Inc. for supplying the Al–Sc master alloy, Dr Robert W. Hyland for useful discussions of the physical metallurgy of Al–Sc alloys, and Professor Alan J. Ardell for a preprint of his paper. Fig. 14 is courtesy of Professor Jong K. Lee.

PY - 2001/6/22

Y1 - 2001/6/22

N2 - Precipitation of the Al3Sc (L12) phase in aluminum alloys, containing 0.1, 0.2 or 0.3 wt% Sc, is studied with conventional transmission and high-resolution (HREM) electron microscopies. The exact morphologies of the Al3Sc precipitates were determined for the first time by HREM, in Al-0.1 wt% Sc and Al-0.3 wt% Sc alloys. The experimentally determined equilibrium shape of the Al3Sc precipitates, at 300°C and 0.3 wt% Sc, has 26 facets, which are the 6 {100} (cube), 12 {110} (rhombic dodecahedron), and 8 {111} (octahedron) planes, a Great Rhombicuboctahedron. This equilibrium morphology had been predicted by first principles calculations of the pertinent interfacial energies. The coarsening kinetics obey the (time)1/3 kinetic law of Lifshitz-Slyozov-Wagner theory and they yield an activation energy for diffusion, 164±9 kJ/mol, that is in agreement with the values obtained from tracer diffusion measurements of Sc in Al and first principles calculations, which implies diffusion-controlled coarsening.

AB - Precipitation of the Al3Sc (L12) phase in aluminum alloys, containing 0.1, 0.2 or 0.3 wt% Sc, is studied with conventional transmission and high-resolution (HREM) electron microscopies. The exact morphologies of the Al3Sc precipitates were determined for the first time by HREM, in Al-0.1 wt% Sc and Al-0.3 wt% Sc alloys. The experimentally determined equilibrium shape of the Al3Sc precipitates, at 300°C and 0.3 wt% Sc, has 26 facets, which are the 6 {100} (cube), 12 {110} (rhombic dodecahedron), and 8 {111} (octahedron) planes, a Great Rhombicuboctahedron. This equilibrium morphology had been predicted by first principles calculations of the pertinent interfacial energies. The coarsening kinetics obey the (time)1/3 kinetic law of Lifshitz-Slyozov-Wagner theory and they yield an activation energy for diffusion, 164±9 kJ/mol, that is in agreement with the values obtained from tracer diffusion measurements of Sc in Al and first principles calculations, which implies diffusion-controlled coarsening.

KW - Aluminum

KW - Microstructure

KW - Phase transformations

KW - Scandium

KW - Transmission electron microscopy (TEM)

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EP - 1919

JO - Acta Materialia

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