Abstract：Recently, global warming and energy issues have attracted more and more attention, with the rapid economic development. In order to promote the sustainable development of resources light weight and high performance of materials can save resources and protect the environment. Aluminum alloys have important applications in the field of aerospace and transportation. The study of phase diagrams of related systems can provide important basic data for the design of high-strength aluminum alloys. The liquidus surface projections of the Al-Co-Er system were studied by X-ray diffraction (XRD), scanning electron microscopy (SEM) and electron probe micro-analysis (EPMA) techniques. A total of 10 ternary compound phases were measured and a number of alloy solidification channels were established. On this basis, the projection of liquidus in Al-Co-Er ternary system was constructed by combining with the phase diagram of binary system reported in literature. In conclusion, 25 four-phase equilibrium reactions were deduced, of which 8 reactions were ternary eutectic and 17 reactions were ectoectic.
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