Aluminum alloy material for integral low-pressure casting of hollow auxiliary frame and preparation method of aluminum alloy material

According to the aluminum alloy material for the integral low-pressure casting hollow auxiliary frame and the preparation method of the aluminum alloy material, the aluminum alloy material for the integral low-pressure casting hollow auxiliary frame is obtained through the steps of component design, alloying treatment, rotary blowing refining, modification treatment, refining treatment, filtering and the like; the aluminum alloy material comprises the following components in percentage by weight: 6.5 to 7.5 percent of Si, 0.6 to 1.0 percent of Cu, 0.6 to 1.5 percent of Zn, 0.25 to 0.45 percent of Mg, 0.08 to 0.2 percent of Ti, less than or equal to 0.2 percent of Zr, less than or equal to 0.2 percent of Fe, less than or equal to 0.1 percent of Mn, less than or equal to 0.01 percent of Sn and the balance of Al, the alloy material is good in mechanical property. 本发明涉及的一种用于整体式低压铸造空心副车架的铝合金材料及其制备方法，经过成分设计、合金化处理、旋转喷吹精炼、变质处理、细化处理、过滤等步骤，获得用于整体式低压铸造空心副车架的铝合金材料，按照重量百分比计包含如下组分Si：6.5～7.5％wt.％，Cu：0.6～1.0％wt.％，Zn：0.6～1.5％