Effects of substituting rare-earth elements for scandium in a precipitation-strengthened Al-0.08 at. %Sc alloy

Richard A. Karnesky*, Marsha E. van Dalen, David C. Dunand, David N. Seidman

*Corresponding author for this work

Research output: Contribution to journalArticle

95 Scopus citations

Abstract

The microhardness of Al-0.06 Sc-0.02 RE alloys (at.%, with RE (rare-earth) = Dy, Er, Gd, Sm, Y, or Yb) is measured as a function of aging time at 300 °C. As compared to Al-0.08 Sc, the ternary alloys exhibit: (i) the same incubation time, except for Al-0.06 Sc-0.02 Yb which hardens much faster; (ii) the same or reduced peak microhardnesses (which are higher than for Al-0.06 Sc); and (iii) the same over-aging behavior. All REs segregate to the core of Al3(Sc1-xREx) precipitates.

Original languageEnglish (US)
Pages (from-to)437-440
Number of pages4
JournalScripta Materialia
Volume55
Issue number5
DOIs
StatePublished - Sep 2006

Keywords

  • Aluminum alloys
  • Lanthanides
  • Precipitation strengthening
  • Rare-earth elements
  • Scandium

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys

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