AZ31镁合金挤出板降温热轧组织和织构演变.PDF

第 19 卷第 7 期 中国有色金属学报 2009 年 7 月 Vol.19 No.7 The Chinese Journal of Nonferrous Metals Jul. 2009 文章编号：1004-0609(2009)07-1182-07 AZ31 镁合金挤出板降温热轧的组织和织构的演变 1 1 2 曲家惠 ，岳明凯 ，黄 涛 (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。 关键词：镁合金；轧制；退火；组织；织构 中图分类号：TG 146.22 文献标识码：A Evolution of microstructure and texture of AZ31 magnesium alloy extrusion sheet by hot rolling with falling temperature 1 1 2 QU Jia-hui , YUE Ming-kai , HUANG Tao (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 aroun