Erbium and ytterbium solubilities and diffusivities in aluminum as determined by nanoscale characterization of precipitates

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

92 Scopus citations

Abstract

Binary aluminum alloys with 0.03-0.06 at.% RE (RE = Yb or Er) were aged to produce coherent, nanosize Al3RE precipitates in an α-Al matrix. The temporal evolution of precipitate radii and matrix concentrations at 300 °C were measured by transmission electron microscopy and local-electrode atom-probe tomography, respectively. The temporal dependence of the matrix concentration of each RE was utilized to determine its solubility in Al. The solubility and the coarsening rate constants were used to determine the diffusivity of each RE in α-Al and the α-Al/Al3RE interfacial free energies at 300 °C. When compared to Sc, both Yb and Er exhibited smaller solubilities but larger diffusivities in α-Al and larger α-Al/Al3RE interfacial energies.

Original languageEnglish (US)
Pages (from-to)4081-4089
Number of pages9
JournalActa Materialia
Volume57
Issue number14
DOIs
StatePublished - Aug 1 2009

Keywords

  • Aluminum alloys
  • Coarsening
  • Diffusion
  • Precipitation
  • Rare-earth elements

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Ceramics and Composites
  • Polymers and Plastics
  • Metals and Alloys

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