On the role of Sc in powders and spray deposits of hypoeutectic Al-Cu

• Author(s) / Creator(s)

  • Henein, H.
  • Bogno, A.-A.
  • Yin, S.
  • Natzke, P.
  • Gallerneault, M.

• Scandium (Sc) is an expensive alloying element which has an important effect on the
  properties of aluminum alloys. It is of interest to determine for a variety of solidification
  conditions the effect of minor addition, in the hypoeutectic levels, of Sc on Al alloys. This
  study builds on past work on rapid and slow solidification of Al-4.5Cu-0.4Sc (wt%) by
  comparing previous microstructures to those obtained using spray forming of strip. The
  effect of Sc (0.4wt%) on the scale of the microstructure of as-atomized powders and asdeposited strips (SD) is found to be negligible in the investigated alloys. The eutectic
  undercooling of the Al-4.5Cu-0.4Sc (wt%) alloy is the same for both powders and SD.
  This is attributed to eutectic nucleation and growth following the same path in both
  solidification processes, characterized by an extended solubility of Sc in the primary α-Al
  matrix, as evidenced by the resulting Sc-rich precipitates and inherent age hardening upon
  annealing of the as-solidified samples. This work contributes to building an understanding
  of rapidly cooled structures and their subsequent self-aging in advanced manufacturing
  processes.

• Date created

  2022-01-01

• Subjects / Keywords

  • Undercooling
  • Atomization
  • Powders
  • Spray Deposition
  • Al-Cu
  • Scandium
  • Solidification Microstructures

• Type of Item

  Article (Published)

• DOI

  https://doi.org/10.7939/r3-3v7w-cj86

• License

  Attribution-NonCommercial-NoDerivatives 4.0 International