Creep- and coarsening properties of Al-0.06 at.% Sc-0.06 at.% Ti at 300-450 °C

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

54 Scopus citations

Abstract

Upon aging at 300-450 °C, nanosize, coherent Al3(Sc1-xTix) precipitates are formed in pure aluminum micro-alloyed with 0.06 at.% Sc and 0.06 at.% Ti. The outstanding coarsening resistance of these precipitates at these elevated temperatures (61-77% of the melting temperature of aluminum) is explained by the significantly smaller diffusivity of Ti in Al when compared to that of Sc in Al. Furthermore, this coarse-grained alloy exhibits good compressive creep resistance for a castable, heat-treatable aluminum alloy: the creep threshold stress varies from 17 MPa at 300 °C to 7 MPa at 425 °C, as expected if the climb bypass by dislocations of the mismatching precipitates is hindered by their elastic stress fields.

Original languageEnglish (US)
Pages (from-to)4369-4377
Number of pages9
JournalActa Materialia
Volume56
Issue number16
DOIs
StatePublished - Oct 2008

Keywords

  • Aluminum alloys
  • Creep
  • Nanostructure
  • Precipitation
  • Titanium

ASJC Scopus subject areas

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

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