Precipitation Strengthening in Al (Sc,Ti) Alloys

Marsha E. Van Dalen*, David C Dunand, David N Seidman

*Corresponding author for this work

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

3 Scopus citations


Three-dimensional atom probe (3DAP) and field-ion microscopies, together with microhardness measurements, are employed to analyze Al3(Sc 1-xTix) precipitates in an Al-0.06at%Sc-0.06at.%Ti alloy aged at 300°C for different times. The field-ion microscope images show a relatively high number density of precipitates (estimated at (3±2)×1021ppt m-3) at the aging times analyzed. Concentration profiles obtained with 3DAP microscopy show that both Sc and Ti partition to these precipitates. While most of the Sc is contained in the precipitates, the Ti resides mainly in the matrix in solid solution. Consequently, the addition of Ti increases the hardness of this alloy only modestly over that of binary Al-Sc alloys. Additionally, the coherent Al 3(Sc1-xTix) precipitates remain stable and coarsening-resistant up to aging times of at least 240 hr. at 300°C.

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 pages7
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


  • Al-Sc-Ti alloys
  • Microstructure
  • Precipitation hardening
  • Three-dimensional atom-probe microscopy

ASJC Scopus subject areas

  • Materials Science(all)


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