AZ31镁合金板材压弯–轧平复合形变组织性能研究  

Study of Composite Deformation Properties of AZ31 Magnesium Alloy Sheet Bending-Rolling Flat

作　　者：梁海成[1] 张玉鹏 刘凤国[1] 崔海涛 

机构地区：[1]沈阳理工大学,辽宁 沈阳

出　　处：《冶金工程》2022年第4期267-277,共11页Metallurgical Engineering

摘　　要：为探究镁合金压弯轧平复合形变对其组织影响,通过构建宏观有限元模型,微观动态再结晶模型,对不同厚度的AZ31镁合金在400℃下多方向压弯–轧平复合形变进行模拟,并检测其织构变化情况。研究结果表明:等效应力随道次增加而增加,随板材厚度增加而减小,波峰应力值大于波谷处;随着变形道次增加再结晶现象更加明显,形变过程中出现孪晶,两道次孪晶比例上升。采用元胞自动机法(CA),模拟AZ31镁合金复合形变中的微观组织变化,微观模拟结果与实验吻合。通过EBSD检测可知,复合形变能有效弱化板材基面织构。通过建立AZ31镁合金复合形变微观仿真模型,能够模拟仿真压弯轧平复合形变过程,对镁合金复合形变有一定指导作用。In order to investigate the effect of bending-rolling composite deformation of magnesium alloy on its organization, by constructing macroscopic finite element model and microscopic dynamic recrystallization model, the multi-directional bending-rolling composite deformation of AZ31 magnesium alloy with different thicknesses was simulated at 400˚C, and examined the change of its weave. The results show that: the equivalent stress increases with the number of passes and decreases with the thickness of the plate, and the peak stress value is larger than the trough;the recrystallization phenomenon is more obvious with the increase of deformation passes, and twinning occurs during the deformation process, and the proportion of twinning increases in two passes. The microstructure changes in the composite deformation of AZ31 magnesium alloy were simulated by the cellular automata method (CA), and the microscopic simulation results were consistent with the experiments. The composite deformation can effectively weaken the basal weave of the plate as shown by EBSD inspection. By establishing the microscopic simulation model of composite deformation of AZ31 magnesium alloy, it is able to simulate the process of composite deformation of press bending and rolling flat, which is a certain guidance for composite deformation of magnesium alloy.

关 键 词：AZ31镁合金 复合形变 有限元 组织模拟 织构弱化 

分 类 号：TG146.22[一般工业技术—材料科学与工程]