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采用循环扩挤(cyclic expansion-extrusion,CEE)变形工艺挤压AZ80镁合金并借助金相组织观察、拉伸性能测试和EBSD研究了多道次挤压对该合金的组织与性能影响。结果表明:AZ80镁合金经过CEE变形后,晶粒的尺寸随着挤压道次的增加而减小,4道次挤压后,晶粒尺寸细化至2μm,整体分布均匀且呈等轴晶,但是晶粒的细化程度并不是一直随挤压道次的增加而提高,2道次挤压后,随着挤压道次的增加,晶粒的细化程度减慢;镁合金CEE变形后的抗拉强度、屈服强度和伸长率均随挤压道次的增加而不断提高;CEE变形的细化机制是连续动态再结晶。
The cyclic extrusion-extrusion (CEE) deformation process was used to extrude AZ80 magnesium alloy. The microstructure and properties of AZ80 magnesium alloy were investigated by metallographic observation, tensile test and EBSD. The results show that after CEE deformation, the grain size of AZ80 magnesium alloy decreases with the increase of extrusion pass. After 4 passes of extrusion, the grain size is refined to 2μm, and the grain size is uniform and equiaxed , But the degree of grain refinement did not always increase with the increase of extrusion pass. After 2 passes, the refinement of the grains slowed down with the increase of extrusion pass. The deformation of CEE of magnesium alloy The tensile strength, yield strength and elongation of the cemented carbide were increased with the increase of extrusion pass. The refinement mechanism of CEE deformation was continuous dynamic recrystallization.