Influence of scandium on superplastic ductilities in an Al-Mg-Sc alloy

Shogo Komura, Zenji Horita, Minoru Furukawa, Minoru Nemoto, Terence G. Langdon

Research output: Contribution to journalArticle

46 Citations (Scopus)

Abstract

Ultrafine grain sizes, of the order of approximately 0.2 μm, may be introduced into Al-Mg-Sc alloys by subjecting the material to severe plastic deformation through the process of equal-channel angular pressing (ECAP). Experiments were conducted to evaluate the influence of the solution treatment temperature on the ductility of an Al-3% Mg-0.2% Sc alloy after ECAP. The results show the highest ductilities are achieved when the solution treatment temperature is within the narrow range of approximately 878 to about 883 K, immediately below the temperature associated with the onset of partial melting. These high temperatures serve to maximize the amount of scandium in solid solution and this leads, on subsequent heating, to an extensive precipitation of fine secondary Al3Sc particles which inhibit grain growth at the higher temperatures. Conversely, solution treatments at temperatures below approximately 878 K give less Sc in solid solution within the matrix and the precipitation of the Al3Sc particles is then insufficient to retain a uniform ultrafine microstructure.

Original languageEnglish
Pages (from-to)2571-2576
Number of pages6
JournalJournal of Materials Research
Volume15
Issue number11
DOIs
Publication statusPublished - Nov 2000

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanics of Materials
  • Mechanical Engineering

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