Aluminum has high density and light weight. The plasticity of pure aluminum is high, and it can process various pressures, but the strength of aluminum is low, so it can't be used as a structural material. It has been found that the strength of aluminum alloy can be greatly improved by adding a proper amount of certain elements and then making aluminum alloy by cold or heat. The strength limit can be increased to 50 ~ 60 kg/mm, which is equivalent to the strength of low alloy steel. Aluminum and its alloys are widely used because of its light weight, high strength, good electrical and thermal conductivity, easy processing and deformation, non-toxic and environmental protection, and rich aluminum content. The study of Al-Cu alloy with high strength and toughness is a hot spot in the field of aluminum research at present. Aluminum is added to copper (Cu), magnesium (Mg), silicon (Si) and manganese (Mn> zinc (Zn). Among all kinds of aluminum alloys, Al-Cu alloy has high potential toughness. Due to the low gas content, aluminum castings obtained by melt casting can be strengthened by solid solution treatment of the castings, not to mention the mechanical properties of high alloys. In this experiment, Al-Cu alloy was taken as the research object. By melting Al -50% Cu alloy and pure Al -5% Cu alloy, the castings were treated by solid solution and aging for different time. By observing the microstructure, the influence of heat treatment time on the microstructure and properties of the alloy was obtained. Key words: Al-Cu alloy, melting, solution treatment, aging treatment.

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