Aluminum alloy and preparation method and application thereof

In order to solve the problem that an existing aluminum alloy cannot meet the requirements for mechanical properties and heat dissipation performance at the same time, an aluminum alloy is provided and comprises, by mass, 9%-11% of Si, 0.001%-0.2% of Mg, 0.3%-0.7% of Fe, 0.003%-0.04% of Sr, 0.003%-0.03% of B, 0.001%-0.2% of Zn, 0.001%-0.1% of Cu, 0.001%-0.09% of Mn, less than 0.05% of Cr, 0.002%-0.05% of Ga, 0.001%-0.01% of Mo and the balance aluminum and other elements, and the total amount of the other elements is less than 0.1%. Meanwhile, the invention further discloses a preparation method and application of the aluminum alloy. The aluminum alloy provided by the invention ensures high thermal conductivity on the premise of not sacrificing the various types of mechanical properties, and meanwhile the aluminum alloy is excellent in flowability, relatively low in process requirement of the materials and good in process adaptability. 为克服现有的铝合金无法兼顾力学性能和散热性要求的问题，本发明提供了一种铝合金，包括如下质量百分比的组分：Si的含量为9-11％，Mg的含量为0.001