Characterisation of rosette formation in an aluminium – Silicon alloy

Deni Ferdian, Y. Thebault, A. Freulon, J. Lacaze

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

Differential thermal analysis has been used to investigate the effect of cooling rate on rosette formation during solidification of a synthetic Al–Fe–Si alloy. Rosettes can be characterised as a very fine multiphase structure within more or less convex areas dispersed in the matrix. Their formation during solidification is related with liquid entrapment and high solidification undercooling associated with the need of independent nucleation events of second phases. It is here shown that their density and internal coarseness depend on cooling rate. Further, metallographic observation of rosettes in contact with large precipitate of β-Al9Fe2Si2 phase allowed to conclude that this latter phase does not help silicon nucleation.

Original languageEnglish
Pages (from-to)290-294
Number of pages5
JournalInternational Journal of Cast Metals Research
Volume28
Issue number5
DOIs
Publication statusPublished - 1 Oct 2015

Keywords

  • Al–Si alloys
  • Differential thermal analysis
  • Eutectic undercooling
  • Rosette
  • Solidification sequence

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