Abstract: Microalloying is an effective method to improve the properties of aluminum alloys. Sn is one of the most potential microalloying elements in aluminum alloy, which can significant improve the properties of these alloys. Addition of Sn can distinctly impact the aging precipitation in aluminum alloys due to its low solubility and high diffusivity in matrix and the strong interaction energy with vacancy. This paper introduces the influence of Sn addition on the microstructure and the mechanical properties of the heat-treatable aluminum alloys, and the mechanism of Sn addition on the precipitation is discussed. Besides, the problems and research directions are pointed out.
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