Differential thermal analysis assessment of beta phase precipitation in Al-6.5Si-1Fe alloy

Deni Ferdian, Bambang Suharno, B. Duployer, C. Tenailleau, L. Salvo, J. Lacaze

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Iron-bearing intermetallic phases formed during solidification of Al-Si casting alloys are known for having detrimental effect on their mechanical properties. This is particularly the case of the β-Al5FeSi phase which precipitates as thin and extended plates. Many researchers already studied the factors that could influence the formation of this phase and in most cases it has been concluded that low-level additives (e.g. manganese) may lead to the replacement of the beta phase with other intermetallics that are less harmful because of being more compact.In this preliminary work, differential thermal analysis (DTA) was used to study the effect of cooling rate (0.2-40 °C/min) on beta phase formation in Al-6.5Si-1Fe alloy. The effect of cooling rate on the characteristic temperature for phase changes was described and compared to literature information. The beta phase was then characterized using scanning electron microscopy and X-ray tomography. Metallographic analysis showed the phase morphology was heavily affected by the cooling rate, and parameters to quantify this have been selected and measured. Moreover, observation also revealed that some alpha phase precipitates at low cooling rate.

Original languageEnglish
Pages (from-to)821-825
Number of pages5
JournalTransactions of the Indian Institute of Metals
Volume65
Issue number6
DOIs
Publication statusPublished - 1 Jan 2012

Keywords

  • Beta intermetallic phase
  • Cooling rate
  • DTA
  • X-ray tomography

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