Magnesium alloy rotary body structural part and preparation process thereof

The preparation technology comprises the following steps that S1, a magnesium-lithium alloy cast ingot is subjected to skin turning and blanking, and a forging stock is obtained; s2, after the forging stock is heated and subjected to heat preservation, multidirectional forging cogging is conducted, air cooling is conducted to the room temperature after forging, and a forge piece with the length-diameter ratio being 3.5-7.0 is obtained; s3, the forge piece is sawn to obtain a plurality of ingot blanks, after the ingot blanks are heated and subjected to heat preservation, die forging forming is carried out, the die forging pressing speed is 2-10 mm/s, a die forging piece of a rotary body structure is obtained through die forging forming, the die forging piece is demoulded, and air cooling is carried out to the room temperature after demoulding; and S4, aging heat treatment is conducted on the die forging after demolding, and the die forging is cooled to the room temperature. According to the preparation technol