Effect of Elements Cerium and Lanthanum on Eutectic Solidification of Al-Si-Cu near Eutectic Cast Alloy

Abstract:

The properties of Al-Si-Cu cast alloys are strongly affected by eutectic Al-Si and Al-Cu phases. The characteristic parameters of these two phases with additions cerium 1wt % (Ce) and lanthanum1 wt % (La) were investigated in Al-11Si-2Cu near eutectic alloy using computer-aided cooling curve thermal analysis. As a result, the La additive showed the highest (T_N^Al-Si) while the Ce additive showed very little effect. In addition, the growth temperature (T_G^Al-Si) is decreased by adding Ce compared to the base alloy and La addition. Additives showed an increase of recalescence magnitude (T_R^Al-Si). Addition La and Ce increased the nucleation and growth temperature of Al-Cu phase. The microstructure analysis on the silicon morphology showed that 1 wt % La and 1 wt % Ce additions play refiner role in Al-Si-Cu near eutectic alloys. Findings are also confirmed by aspect ratio of eutectic silicon phase.

• Periodical: Advanced Materials Research (Volume 845)
• Pages: 118-122
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.845.118
• Online since: December 2013
• Authors: M.B.A. Asmael*, Roslee Ahmad, Ali Ourdjini, S. Farahany
• Keywords: Aluminium Alloy, Cerium, Eutectic, Lanthanum, Thermal Analysis

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