Journal of Materials Science

, Volume 47, Issue 8, pp 3706–3712 | Cite as

Density and thermal expansion of liquid Al–Si alloys

  • Julianna Schmitz
  • Bengt Hallstedt
  • Jürgen Brillo
  • Ivan Egry
  • Michael Schick
Article

Abstract

The density of Al-rich liquid Al–Si alloys was measured contactlessly on electromagnetically levitated samples using optical dilatometry. Data were obtained for samples covering compositions up to 50 at.% Si and in a temperature range between 650 and 1500 °C. The densities can be described as linear functions of temperature with negative slopes. Moreover, they increase monotonically with an increase of Si concentration. In a temperature range between 1100 and 1400 °C, it can be deduced from the composition dependence of the density that virtually no excess volume arises during alloying of the pure elements. For lower temperatures an excess volume is discussed, considering the temperature dependence of Si density literature data. The density data were integrated in a thermodynamic model description of the Al–Si system. In this way volume changes during solidification and changes in phase equilibria as function of pressure can be calculated.

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Copyright information

© Springer Science+Business Media, LLC 2012

Authors and Affiliations

  • Julianna Schmitz
    • 1
  • Bengt Hallstedt
    • 2
  • Jürgen Brillo
    • 1
  • Ivan Egry
    • 1
  • Michael Schick
    • 2
  1. 1.Institut für Materialphysik im WeltraumDeutsches Zentrum für Luft- und Raumfahrt (DLR)CologneGermany
  2. 2.Materials ChemistryRWTH Aachen UniversityAachenGermany

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