Nano tungsten carbide modified Mg-Al-Zn series magnesium alloy material used for casting automobile parts and preparation method of material

The invention relates to the technical field of magnesium alloy preparation, in particular to a nano tungsten carbide modified Mg-Al-Zn series magnesium alloy material used for casting automobile parts and a preparation method of the material. The material belongs to Mg-Al-Zn series heat-resisting alloy, Cu and Si are mixed in the material so that the alloy structure can be further improved, crystal nucleus can be fined, and the comprehensive mechanical properties are improved. In addition, a polyvinylpyrrolidone absolute ethyl alcohol solution serves as a medium, nano tungsten carbide is dispersed in the medium, then the medium and Mg powder are mixed and ground, the nano tungsten carbide is uniformly wrapped with and dispersed in the Mg powder, the medium and other metal elements can be mixed more substantially in the later smelting process, and an efficient stable modification effect is achieved. The strength of the treated magnesium alloy is improved remarkably, the abrasion resistance and the heat resistance are better, and both the machining performance and the using performance of the automobile parts made of the material can be improved.