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研究AZ61镁合金在等温锻造过程中的显微组织及力学性能变化,讨论晶粒细化机理及显微组织与力学性能的关系。结果表明:合金的平均晶粒尺寸随着多向锻造道次的增加而减小,在初始的1、2道次变形过程中,晶粒急剧细化,随着变形道次的增加,晶粒细化能力减弱,经过6道次变形后,晶粒尺寸由初始的148μm细化到14μm。晶粒细化主要是由于合金在锻造过程中发生了连续动态再结晶。随着变形道次的增加,合金的抗拉强度、屈服强度和伸长率逐渐增加。
The microstructure and mechanical properties of AZ61 magnesium alloy during isothermal forging process were studied. The relationship between grain refinement mechanism and microstructure and mechanical properties was discussed. The results show that the average grain size of the alloy decreases with the increasing number of forging passes. In the first and second pass deformations, the grains sharply refine. With the increase of deformation pass, The refining ability is weakened. After 6 passes, the grain size is refined from the initial 148μm to 14μm. The grain refinement is mainly due to continuous dynamic recrystallization of the alloy during the forging process. With the increase of deformation pass, the tensile strength, yield strength and elongation of the alloy gradually increase.