Thermal analysis during solidification of cast Al–Si alloys

Solidification of a series of aluminium alloys was studied by means of thermal analysis; the study was centred on the effect that silicon and iron exert on the temperatures for the onset of different microstructural characteristics. The alloys were prepared in a gas fired furnace and were poured int...

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Bibliographic Details
Published in:Thermochimica acta 2010-10, Vol.510 (1), p.82-87
Main Authors: Canales, A.A., Talamantes-Silva, J., Gloria, D., Valtierra, S., Colás, R.
Format: Article
Language:English
Subjects:
Alloys
Aluminium
Aluminum
Aluminum base alloys
Applied sciences
Casting
Eutectic temperature
Exact sciences and technology
Iron
Metals. Metallurgy
Production of metals
Silicon
Solidification
Thermal analysis
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Summary:Solidification of a series of aluminium alloys was studied by means of thermal analysis; the study was centred on the effect that silicon and iron exert on the temperatures for the onset of different microstructural characteristics. The alloys were prepared in a gas fired furnace and were poured into graphite moulds instrumented with a type K thermocouple. The cooling curve was registered with the aid of a computer-driven data logging system and was derived to determine the temperatures for the onset of the formation of pre-eutectic aluminium dendrites, and those for the Al–Si eutectic and for a complex Al–Si–Cu–Mg eutectic. It was found that silicon exerts a strong influence on the two former temperatures, whereas the third one is independent of the content of silicon or iron.
ISSN:0040-6031
1872-762X
DOI:10.1016/j.tca.2010.06.026