Die-casting aluminum alloy, preparation method and application

According to the die-casting aluminum alloy, the preparation method and the application, by adopting Sb + Y composite modification treatment, online quenching and artificial aging treatment, the mechanical property and the heat-conducting property of the alloy are obviously improved, the tensile strength of the prepared die-casting aluminum alloy reaches 250 MPa or above, the yield strength reaches 110 MPa or above, the heat-conducting property reaches 180 W/m.k or above, and the service life of the die-casting aluminum alloy is prolonged. The mechanical property and the heat-conducting property are kept at a relatively high level, and the problem of mutual restriction of the mechanical property and the heat-conducting property is solved. Therefore, the high-thermal-conductivity die-casting aluminum alloy provided by the invention not only has good thermal conductivity, but also keeps good mechanical properties, and can be used for manufacturing products such as 5G communication base station heat dissipation