NI-AL-RE TERNARY EUTECTIC ALLOY AND PREPARATION PROCESS THEREFOR

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The present invention provides a Ni-Al-RE ternary eutectic alloy and a preparation process therefor. The alloy is composed of the following elements in percentage by weight : 2.50-19.50% of aluminum (Al), 1.30-20.0% of a rare earth (RE), and ≤ 0.10% of other impurity elements, the balance being nickel (Ni). The alloy has a microstructure in a completely eutectic form, and has a density of 6.8-7.1 g/cm3. The raw materials are formulated according to the indicated percentages, and placed into a vacuum induction melting furnace. The furnace is evacuated to ensure a vacuum of 10-5 Pa, and power is increased to ensure complete melting of the raw materials. The molten alloy melt is cast into a cast iron mold to produce alloy ingots. The eutectic phase in the microstructure of the alloy of the present invention has high hardness, such that the overall hardness of the material is higher, with hardness twice as high as that of a pure binary Ni-Al alloy. The preparation process is simple and efficient, no secondary feeding is required, and a desired alloy can be obtained by single smelting, and the alloy has a wide range of components, which is advantageous for industrial applications.