@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",
language = "English (US)",
isbn = "0873395573",
series = "Materials Science and Technology 2003 Meeting",
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",
}