The effect of heat transfer on local solidification kinetics of eutectic Al-Si cast alloy |
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Authors: | C González-Rivera H Cruz M A García H J A Juarez-Islas |
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Affiliation: | (1) Fac. de Quimica, Departamento de Metalurgia, Circuito Exterior S/N, Cd. Universitaria, 04510 Mexico, D.F., Mexico;(2) Instituto de Investigaciones en Materiales, Departamento de Materiales Metalicos y Ceramicos, Circuito Exterior S/N, Cd, Universitaria, 04510 Mexico, D.F., Mexico |
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Abstract: | Recently, Fourier thermal analysis (FTA) has been proposed as a suitable technique to obtain information about local solidification
kinetics in casting alloys. In this work, FTA was applied to a near-eutectic aluminum-silicon cast alloy in order to seek
experimental evidence supporting the solidification kinetics obtained from this method. Also, a heat-transfer/solidification-kinetics
model was used to compare predictions with experimental results. The metallographic findings, focused on interlamellar eutectic
spacings in different locations within a cylindrical casting, support the solidification kinetics obtained from FTA. The model
and experimental outcome including FTA results and metallographic observations suggest that local solidification kinetics
depend strongly on local heat transfer, and the analysis of this dependence may be used to explain the observed changes in
microstructural characteristics at different locations within castings. |
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Keywords: | Al-Si eutectic Fourier thermal analysis interlamellar eutectic spacings solidification kinetics |
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