Creep of Al-Sc microalloys with rare-earth element additions

Richard A. Karnesky*, David N. Seidman, David C. Dunand

*Corresponding author for this work

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

54 Scopus citations


Cast and aged Al-Sc microalloys are creep-resistant to 300°C, due to the blocking of dislocations by nanosize, coherent Al3Sc (Ll 2) precipitates. Rare-earth elements substitute for Sc in these precipitates, leading to a higher number density of smaller precipitates, which have a greater lattice-parameter mismatch with Al than in the Al-Sc binary microalloy. This leads to an improvement in both ambient temperature microhardness and high temperature creep. Creep threshold stresses of Al-Sc-RE (RE = Y, Dy, or Er) at 300°C are higher than for Al-Sc and Al-Sc-M (M = Mg, Ti, or Zr) microalloys. This is in agreement with a dislocation climb model that includes the elastic stress fields of the precipitates.

Original languageEnglish (US)
Title of host publicationAluminium Alloys 2006
Subtitle of host publicationResearch Through Innovation and Technology - Proceedings of the 10th International Conference on Aluminium Alloys
PublisherTrans Tech Publications Ltd
Number of pages6
EditionPART 2
ISBN (Print)9780878494088
StatePublished - 2006
Event10th International Conference on Aluminium Alloys, (ICAA-10) - Vancouver, Canada
Duration: Jul 9 2006Jul 13 2006

Publication series

NameMaterials Science Forum
NumberPART 2
ISSN (Print)0255-5476
ISSN (Electronic)1662-9752


Other10th International Conference on Aluminium Alloys, (ICAA-10)


  • Creep
  • Precipitation strengthening
  • Rare-earth elements
  • Scandium

ASJC Scopus subject areas

  • General Materials Science
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering


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