Criteria for developing castable, creep-resistant aluminum-based alloys - A review

Keith E. Knipling, David C Dunand, David N Seidman*

*Corresponding author for this work

Research output: Contribution to journalReview articlepeer-review

117 Scopus citations

Abstract

We describe four criteria for the selection of alloying elements capable of producing castable, precipitation-strengthened Al alloys with high-temperature stability and strength: these alloying elements must (i) be capable of forming a suitable strengthening phase, (ii) show low solid solubility in Al, (iii) low diffusivity in Al, and (iv) retain the ability for the alloy to be conventionally solidified. With regard to criterion (i), we consider those systems forming AI3M trialuminide compounds with a cubic L1 2 crystal structure, which are chemically and structurally analogous to Ni3Al in the Ni-based superalloys. Eight elements, clustered in the same region of the periodic table, fulfill criterion (i): the first Group 3 transition metal (Sc), the three Group 4 transition metals (Ti, Zr, Hf) and the four latest lanthanide elements (Er, Tm, Yb, Lu). Based on a review of the existing literature, these elements are assessed in terms of criteria (ii) and (iii), which satisfy the need for a dispersion in Al with slow coarsening kinetics, and criterion (iv), which is discussed based on the binary phase diagrams.

Original languageEnglish (US)
Pages (from-to)246-265
Number of pages20
JournalInternational Journal of Materials Research
Volume97
Issue number3
StatePublished - Dec 28 2006

Keywords

  • Aluminum alloys
  • Creep
  • Precipitation strengthening
  • Trialuminides

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Metals and Alloys
  • Materials Chemistry

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