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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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Official URL: http://www.springerlink.com/openurl.asp?genre=article&id=doi:10.1007/s10853-011-6219-8

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.

Document Type:Article
Title:Density and thermal expansion of liquid Al–Si alloys
Authors:
AuthorsInstitution or Email of Authors
Schmitz, JuliannaDLR, Institut für Materialphysik im Weltraum
Hallstedt, BengtRWTH Aachen, Materials Chemistry
Brillo, JürgenDLR, Institut für Materialphysik im Weltraum
Egry, IvanDLR, Institut für Materialphysik im Weltraum
Schick, MichaelRWTH Aachen, Materials Chemistry
Date:14 January 2012
Journal or Publication Title:Journal of Materials Science
Refereed publication:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:47
DOI:10.1007/s10853-011-6219-8
Page Range:pp. 3706-3712
ISSN:0022-2461
Status:Published
Keywords:density; thermal expansion; liquid Al-Si alloys; electromagnetic levitation; CALPHAD; excess volume; thermophysical properties
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Space (old)
HGF - Program Themes:W FR - Forschung unter Weltraumbedingungen (old)
DLR - Research area:Space
DLR - Program:W FR - Forschung unter Weltraumbedingungen
DLR - Research theme (Project):W - Vorhaben Materialforschung unter Mikro-g (old)
Location: Köln-Porz
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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