Strengthening mechanisms in aluminum containing coherent Al3Sc precipitates and incoherent Al2O3 dispersoids

Richard A. Karnesky, Liang Meng, David C. Dunand*

*Corresponding author for this work

Research output: Contribution to journalArticle

59 Scopus citations

Abstract

Dispersion-strengthened-cast aluminum (DSC-Al), consisting of a coarse-grained aluminum matrix containing two populations of particles (30 vol.% of 300 nm Al2O3 incoherent dispersoids and 0.2-0.3 vol.% of 6-60 nm coherent Al3Sc precipitates), was studied. At ambient and elevated temperatures, both populations of particles contribute to strengthening. At 300 °C, creep threshold stresses are considerably higher than for control materials with a single population of either Al2O3 dispersoids or Al3Sc precipitates. This synergistic effect is modeled by considering dislocations pinned at the departure side of incoherent Al2O3 dispersoids (detachment model) and simultaneously subjected to elastic interactions from neighboring coherent Al3Sc precipitates.

Original languageEnglish (US)
Pages (from-to)1299-1308
Number of pages10
JournalActa Materialia
Volume55
Issue number4
DOIs
StatePublished - Feb 1 2007

Keywords

  • Aluminum alloys
  • Creep
  • Metal matrix composites
  • Precipitation
  • Zirconium

ASJC Scopus subject areas

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

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