Key experiments and thermodynamic revision of the binary Al–Sr system

•L=(Al)+SrAl4 eutectic is measured with high precision at 655.6°C.•Solid solubility of Sr in (Al) determined for the first time.•Consistent thermodynamic calculation of Al–Sr phase diagram developed. The Al-rich Al–Sr phase equilibria are in the focus of this study. The temperature of the (Al)–SrAl4...

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Bibliographic Details
Published in:Journal of alloys and compounds 2014-10, Vol.610, p.443-450
Main Authors: Liang, Song-Mao, Engstler, Michael, Groten, Veronika, Barrirero, Jenifer, Mücklich, Frank, Bührig-Polaczek, Andreas, Schmid-Fetzer, Rainer
Format: Article
Language:English
Subjects:
Alloys
Aluminum
Al–Sr system
Atom probe
Calphad assessment
Computer simulation
Cross-disciplinary physics: materials science
rheology
Differential scanning calorimetry
DSC
Eutectic temperature
Exact sciences and technology
Materials science
Mathematical models
Phase diagrams and microstructures developed by solidification and solid-solid phase transformations
Phase diagrams of metals and alloys
Phase transformations
Physics
Thermodynamics
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Summary:•L=(Al)+SrAl4 eutectic is measured with high precision at 655.6°C.•Solid solubility of Sr in (Al) determined for the first time.•Consistent thermodynamic calculation of Al–Sr phase diagram developed. The Al-rich Al–Sr phase equilibria are in the focus of this study. The temperature of the (Al)–SrAl4 eutectic reaction is determined to be 655.6°C by carefully calibrated and controlled differential scanning calorimetry (DSC) experiments. The solid solubility limit of Sr in (Al) at 640°C is determined for the first time by using atom probe tomography to be not higher than 45wt. ppm. The thermodynamic description of the complete Al–Sr system has been advanced by incorporation of these new data using the Calphad method based on a selected previous modeling of the system. In addition, the descriptions of all intermetallic phases were revised to avoid the artifact of kink point appearing on the heat capacity curves of the compounds at melting or transition temperatures of the elements, which is unphysical. The new modeling shows significant improvement on the Al-rich side of the Al–Sr system, forming a sound foundation for developing multicomponent Al-alloy database.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2014.05.018