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Journal of Phase Equilibria and Diffusion

, Volume 35, Issue 2, pp 137–145 | Cite as

On the Liquid/Solid Phase Equilibria in the Al-Rich Corner of the Al-Si-Ti Ternary System

  • O. DezellusEmail author
  • B. Gardiola
  • J. Andrieux
  • M. Lomello-Tafin
  • J. C. Viala
Article

Abstract

The nature of liquid-solid phase equilibria in the Al-rich corner of the Al-Si-Ti system are determined by drawing three isothermal sections at 620, 680 and 727 °C. The solubility of Ti in Al-Si liquids is determined for four different compositions (0, 9, 13 and 18 at.%Si) at temperature below 800 °C. Combination of the two sets of experimental results leads to an attempt of liquidus projection. The primary crystallization surface of Al3Ti is found to extend up to 9.5 at.%Si in the liquid phase at 620 °C and 11 at.%Si at 727 °C. The solubility of Ti is found to be not significantly dependent on the Si content of the liquid. From DSC measurements and deduction on microstructure, the last invariant reaction of the solidification path is found to be quasi-peritectic: \({\text{L}} + \uptau_{1} - {\text{Ti}}_{7} {\text{Al}}_{5} {\text{Si}}_{12} \Leftrightarrow {\text{Al}} + {\text{Si}} .\)

Keywords

aluminum alloys differential scanning calorimetry (DSC) invariant point isopleth isotherm liquidus surface ternary system 

Notes

Acknowledgments

Chemical microanalyses have been performed by the inorganic analysis team of Dr. Ayouni of the Analytical Sciences Institute. SEM and EPMA characterizations were performed at the ‘‘Centre Technologique des Microstructures, Université Lyon 1’’. The authors acknowledge gratefully the members of these services for their assistance.

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Copyright information

© ASM International 2014

Authors and Affiliations

  • O. Dezellus
    • 1
    Email author
  • B. Gardiola
    • 1
  • J. Andrieux
    • 1
  • M. Lomello-Tafin
    • 2
  • J. C. Viala
    • 1
  1. 1.Laboratoire des Multimatériaux et InterfacesUniversité Claude Bernard - UMR CNRS 5615VilleurbanneFrance
  2. 2.Laboratoire SYMME, Polytech’Annecy-ChambéryUniversité de SavoieAnnecy-le-vieuxFrance

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