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

Research output: Chapter in Book/Report/Conference proceedingConference contribution

1 Scopus citations


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 languageEnglish (US)
Title of host publicationAffordable Metal Matrix Composites for High Performance Applications II
EditorsA.B. Pandey, K.L. Kendig, J.J. Lewandowski, S.S. Shah
Number of pages10
StatePublished - Dec 1 2003
EventMaterials Science and Technology 2003 Meeting - Chicago, IL, United States
Duration: Nov 9 2003Nov 12 2003


OtherMaterials Science and Technology 2003 Meeting
Country/TerritoryUnited States
CityChicago, IL


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

ASJC Scopus subject areas

  • Materials Science(all)


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