Mechanical Properties of a Heat-Treatable Al-Sc Alloy Reinforced with Al2O3 Dispersoids

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

Mechanical Properties of a Heat-Treatable Al-Sc Alloy Reinforced with Al₂O₃ Dispersoids

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

^*Corresponding author for this work

Materials Science and Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Scopus citations

Abstract

The mechanical behavior of precipitation-strengthened Al-0.18 wt.% Sc alloys containing 30 vol.% Al₂O₃ dispersoids is studied at 25, 300 and 350°C. The effect of Al₃Sc precipitate size is studied by varying aging treatments. Microhardness measurements show that both populations of particles (nanometer-sized Al₃Sc precipitates and submicron-sized Al₂O₃ dispersoids) contribute to strength at ambient temperature. At elevated temperature, a threshold stress is observed, indicative of interactions between matrix dislocations and the particles. The threshold stress is significantly higher than either Al-0.18 wt.% Sc alloys without Al₂O₃ dispersoids or Al-30 vol.% Al ₂O₃ without Al₃Sc precipitates. This indicates that strengthening is occurring at both length scales and in a nonlinear manner, as the reinforced alloy exhibits strength higher than the sum of the strengths of Al-Sc and Al-Al₂O₃ alloys.

Original language	English (US)
Title of host publication	Affordable Metal Matrix Composites for High Performance Applications II
Editors	A.B. Pandey, K.L. Kendig, J.J. Lewandowski, S.S. Shah
Pages	215-224
Number of pages	10
State	Published - Dec 1 2003
Event	Materials Science and Technology 2003 Meeting - Chicago, IL, United States Duration: Nov 9 2003 → Nov 12 2003

Other

Other	Materials Science and Technology 2003 Meeting
Country/Territory	United States
City	Chicago, IL
Period	11/9/03 → 11/12/03

Keywords

Alumina
Aluminum alloys
Creep
Dispersoid strengthening
Mechanical properties
Precipitation strengthening
Scandium
Threshold stress

ASJC Scopus subject areas

Materials Science(all)

Cite this

@inproceedings{3914110a447441c185436365eef16bd1,

title = "Mechanical Properties of a Heat-Treatable Al-Sc Alloy Reinforced with Al2O3 Dispersoids",

abstract = "The mechanical behavior of precipitation-strengthened Al-0.18 wt.% Sc alloys containing 30 vol.% Al2O3 dispersoids is studied at 25, 300 and 350°C. The effect of Al3Sc precipitate size is studied by varying aging treatments. Microhardness measurements show that both populations of particles (nanometer-sized Al3Sc precipitates and submicron-sized Al2O3 dispersoids) contribute to strength at ambient temperature. At elevated temperature, a threshold stress is observed, indicative of interactions between matrix dislocations and the particles. The threshold stress is significantly higher than either Al-0.18 wt.% Sc alloys without Al2O3 dispersoids or Al-30 vol.% Al 2O3 without Al3Sc precipitates. This indicates that strengthening is occurring at both length scales and in a nonlinear manner, as the reinforced alloy exhibits strength higher than the sum of the strengths of Al-Sc and Al-Al2O3 alloys.",

keywords = "Alumina, Aluminum alloys, Creep, Dispersoid strengthening, Mechanical properties, Precipitation strengthening, Scandium, Threshold stress",

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

year = "2003",

month = dec,

day = "1",

language = "English (US)",

isbn = "0873395573",

pages = "215--224",

editor = "A.B. Pandey and K.L. Kendig and J.J. Lewandowski and S.S. Shah",

booktitle = "Affordable Metal Matrix Composites for High Performance Applications II",

note = "Materials Science and Technology 2003 Meeting ; Conference date: 09-11-2003 Through 12-11-2003",

}

Mechanical Properties of a Heat-Treatable Al-Sc Alloy Reinforced with Al₂O₃ Dispersoids. / Karnesky, Richard A.; Meng, Liang; Seidman, David N et al.
Affordable Metal Matrix Composites for High Performance Applications II. ed. / A.B. Pandey; K.L. Kendig; J.J. Lewandowski; S.S. Shah. 2003. p. 215-224.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

TY - GEN

T1 - Mechanical Properties of a Heat-Treatable Al-Sc Alloy Reinforced with Al2O3 Dispersoids

AU - Karnesky, Richard A.

AU - Meng, Liang

AU - Seidman, David N

AU - Dunand, David C

PY - 2003/12/1

Y1 - 2003/12/1

N2 - The mechanical behavior of precipitation-strengthened Al-0.18 wt.% Sc alloys containing 30 vol.% Al2O3 dispersoids is studied at 25, 300 and 350°C. The effect of Al3Sc precipitate size is studied by varying aging treatments. Microhardness measurements show that both populations of particles (nanometer-sized Al3Sc precipitates and submicron-sized Al2O3 dispersoids) contribute to strength at ambient temperature. At elevated temperature, a threshold stress is observed, indicative of interactions between matrix dislocations and the particles. The threshold stress is significantly higher than either Al-0.18 wt.% Sc alloys without Al2O3 dispersoids or Al-30 vol.% Al 2O3 without Al3Sc precipitates. This indicates that strengthening is occurring at both length scales and in a nonlinear manner, as the reinforced alloy exhibits strength higher than the sum of the strengths of Al-Sc and Al-Al2O3 alloys.

AB - The mechanical behavior of precipitation-strengthened Al-0.18 wt.% Sc alloys containing 30 vol.% Al2O3 dispersoids is studied at 25, 300 and 350°C. The effect of Al3Sc precipitate size is studied by varying aging treatments. Microhardness measurements show that both populations of particles (nanometer-sized Al3Sc precipitates and submicron-sized Al2O3 dispersoids) contribute to strength at ambient temperature. At elevated temperature, a threshold stress is observed, indicative of interactions between matrix dislocations and the particles. The threshold stress is significantly higher than either Al-0.18 wt.% Sc alloys without Al2O3 dispersoids or Al-30 vol.% Al 2O3 without Al3Sc precipitates. This indicates that strengthening is occurring at both length scales and in a nonlinear manner, as the reinforced alloy exhibits strength higher than the sum of the strengths of Al-Sc and Al-Al2O3 alloys.

KW - Alumina

KW - Aluminum alloys

KW - Creep

KW - Dispersoid strengthening

KW - Mechanical properties

KW - Precipitation strengthening

KW - Scandium

KW - Threshold stress

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BT - Affordable Metal Matrix Composites for High Performance Applications II

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