Effects of Yb and Zr microalloying additions on the microstructure and mechanical properties of dilute Al-Sc alloys

Marsha E. Van Dalen*, Thomas Gyger, David C Dunand, David N Seidman

*Corresponding author for this work

Research output: Contribution to journalArticle

74 Scopus citations

Abstract

It is known that Zr and Yb partition to the Al3Sc precipitates created during aging when microalloyed separately in dilute binary Al-Sc alloys. Addition of Zr delays precipitate coarsening, thereby improving the coarsening resistance of the ternary Al-Sc-Zr alloys. Addition of Yb increases the resistance against dislocation climb, thereby improving the creep resistances of the ternary Al-Sc-Yb alloys. A combination of microhardness, creep, and atom probe tomography measurements provide evidence that these effects of Zr and Yb additions are cumulative in quaternary dilute Al-Sc-Yb-Zr alloys: Yb increases their creep resistance at 300 °C compared with ternary Al-Sc-Zr alloys and Zr improves their coarsening resistance at 300 °C compared with ternary Al-Sc-Yb alloys. Additionally, excellent coarsening resistance is observed at 350 and 375 °C.

Original languageEnglish (US)
Pages (from-to)7615-7626
Number of pages12
JournalActa Materialia
Volume59
Issue number20
DOIs
StatePublished - Dec 1 2011

Keywords

  • Aluminum alloys
  • Coarsening
  • Creep
  • Nucleation
  • Precipitation

ASJC Scopus subject areas

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

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