Abstract
In order to confirm the eutectic composition, eutectic temperature and phases of Al-rich Al-RE (La, Ce, Pr, Nd) binary systems, the eutectic Al-RE alloys with the controversial compositions were investigated. The scanning electron microscopy/energy dispersive spectroscopy (SEM/EDS), differential scanning calorimetric (DSC) and cooling curve tests analysis indicated that a similar eutectic composition (∼12 wt.% RE) on the Al-rich region was observed in the Al-La, Al-Ce, Al-Pr and Al-Nd alloys, and the eutectic structure of the alloys was consisted of α-Al and α-Al11RE3 phases by combining with X-ray diffraction (XRD) tests. In addition, the eutectic temperatures determined by DSC and cooling curve tests were very close and around 645 °C.
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