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Type Knipling, Keith E.; Dunand, David C.; Seidman, David N.
  Publication Criteria for Developing Castable, Creep-Resistant Aluminum-Based Alloys–A Review Volume Journal Article
Pages 2006
  Abstract Zeitschrift für Metallkunde  
  Corporate Author Z. Metallkd  
Publisher 97  
Editor 3
  Summary Language 246-265 Series Editor Aluminum alloys; Trialuminides; Precipitation strengthening; Creep; Al-Sc  
Abbreviated Series Title 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) showlow 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 Al3Mtrialuminide compounds with a cubic L12 crystal structure, which are structurally analogous to Ni3Al ( 0) 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 rare-earth elements (Er, Tm, Yb, Lu). Based on a review of the existing literature, these elements are discussed in terms of criteria (ii) and (iii), which satisfy the need for a dispersion in Al with slow coarsening kinetics, and criteria (iv), which is discussed based on the binary phase diagrams.
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no NU @ karnesky @ 236
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