Aluminum alloy and preparation method and application thereof

The invention belongs to the technical field of aluminum alloy materials, and particularly relates to an aluminum alloy and a preparation method and application thereof.The preparation method comprises the steps that firstly, molten aluminum-containing metal and an alterant containing Eu and/or Sb are smelted, and then a first aluminum alloy melt obtained after smelting is subjected to ultrasonic oscillation to obtain a second aluminum alloy melt; next, the second aluminum alloy melt subjected to ultrasonic oscillation is formed, the aluminum alloy is obtained, the alterant can remarkably refine microscopic structures such as crystal grains in aluminum-containing metal, meanwhile, ultrasonic oscillation can crush a phase structure which is separated out first and can also promote uniform distribution of phases, and therefore the mechanical property of the aluminum alloy is improved. The alterant containing Eu and/or Sb is added into the aluminum-containing metal for smelting, ultrasonic oscillation and formin