选用不同的挤压比对变形镁合金AZ80进行管材热挤压工艺试验研究,对挤压前后材料组织与力学性能的变化进行分析。结果表明,热挤压可以显著细化AZ80镁合金的晶粒,而且随着挤压比的增加,晶粒变得更加细小;增大挤压比也可以提高AZ80镁合金的抗拉强度和屈服强度。结果表明,挤压比为18.2,坯料温度为390℃,模具预热温度为360℃,凹模的半模角为60°～70°,可得到均匀的合金组织和良好的力学性能。 Select different extrusion ratio on the deformation of magnesium alloy AZ80 pipe extrusion process test of the material before and after extrusion of the microstructure and mechanical properties of the changes were analyzed. The results show that hot extrusion can remarkably refine the grains of AZ80 magnesium alloy, and the grains become finer with the increase of extrusion ratio. Increasing the extrusion ratio can also improve the tensile strength and yield of AZ80 magnesium alloy strength. The results show that the extrusion ratio is 18.2, the billet temperature is 390 ℃, the mold preheating temperature is 360 ℃, the half mold angle of the die is 60 ° ~ 70 °, the uniform alloy structure and good mechanical properties can be obtained.