Manufacture method of Mg-Zn-Zr serial magnesium alloy die forgings

The invention relates to a manufacture method of Mg-Zn-Zr serial magnesium alloy die forgings, relating to a manufacture method of magnesium alloy die forgings. The invention solves the problems of difficult machine-shaping and limitation on the application fields of ZK61M magnesium alloy, which are caused by serious casting hot cracking tendency and poor plasticity of the existing ZK61M magnesium alloy. The manufacture method of the die forgings is as follows: weighing alloy materials; smelting and pouring to obtain cast ingots; and extruding the cast ingots, and then carrying out die forging and carrying out ageing treatment. The preparation method of the invention can carry out plasticizing shaping on magnesium alloys with complicated shapes, and has the advantages of high accuracy of machining dimension and simple machining process. The magnesium alloy after die forging has high dimensional accuracy and good mechanical property, the longitudinal tensile strength can reach 294N/mm at room temperature, and the percentage of elongation after fracture is greater than or equal to 8%, thus successfully avoiding that novel helicopters are controlled by foreign countries, meeting the immediate needs of military projects and realizing localization of Zhi-9 helicopters.