Density and thermal expansion of liquid Al–Si alloys
Schmitz, Julianna and Hallstedt, Bengt and Brillo, Jürgen and Egry, Ivan and Schick, Michael (2012) Density and thermal expansion of liquid Al–Si alloys. Journal of Materials Science, 47 (8), pp. 3706-3712. DOI: 10.1007/s10853-011-6219-8. ISSN 0022-2461.
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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.
|Title:||Density and thermal expansion of liquid Al–Si alloys|
|Date:||14 January 2012|
|Journal or Publication Title:||Journal of Materials Science|
|In ISI Web of Science:||Yes|
|Page Range:||pp. 3706-3712|
|Keywords:||density; thermal expansion; liquid Al-Si alloys; electromagnetic levitation; CALPHAD; excess volume; thermophysical properties|
|HGF - Research field:||Aeronautics, Space and Transport|
|HGF - Program:||Space|
|HGF - Program Themes:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research area:||Space|
|DLR - Program:||W FR - Forschung unter Weltraumbedingungen|
|DLR - Research theme (Project):||W - Vorhaben Materialforschung unter Mikro-g (old)|
|Institutes and Institutions:||Institute of Materials Physics in Space|
|Deposited By:||Julianna Schmitz|
|Deposited On:||14 Feb 2012 08:35|
|Last Modified:||26 Mar 2013 13:37|
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