(1. 沈阳理工大学 装备工程学院，沈阳 110168；
2. 沈阳师范大学 物理科学与技术学院，沈阳 110034)
摘 要: 研究AZ31镁合金挤出板坯在降温热轧过程中的组织和织构的演变规律。结果表明：退火前滑移和孪生是主要的变形机制和取向硬化机制；退火后长条晶的滑移和细小等轴晶晶界扩散迁移的共同作用成为主要的变形机制；随着压下量的增大，析出物开始破碎和分散，压下量在70%~80%之间时，基面织构组分的取向密度存在突变最大值，形成硬取向较强的{0001}基面织构，软化退火能大幅减弱硬取向；通过一道67%大压下量和一次软化退火可顺利地将AZ31镁合金轧制成厚0.5 mm的薄板。
关键字: 镁合金；轧制；退火；组织；织构
（1. School of Equipment Engineering, Shenyang Ligong University, Shenyang 110168, China;
2. College of Physical Science and Technology, Shenyang Normal University, Shenyang 110034, China）
Abstract:The evolution law of microstructure and texture in extruded sheets of magnesium alloy AZ31 during the hot rolling falling temperature process was studied. The results show that slipping and twinning are the major deforming and orientational hardening mechanism before annealing while the sliding of long grain in combination with the diffusing transfer of fine equiaxed grain boundary becomes a major deforming one after annealing. With increasing the reduction, the precipitation falls to pieces and spreads around. And the basal plane texture component has a maximum mutation value of orientation density with reductions of 70%−80%. So a basal plane texture component {0001} is formed, which has stronger orientation density that can be greatly reduced by softening annealing. A sheet of 0.5 mm in thickness can be made from magnesium alloy AZ31 by one 67% reduction pass and one softening annealing pass.
Key words: magnesium alloy; hot-rolling; annealing; microstructure; texture
