AE81镁合金轧制变形显微组织演变的研究  

Study on Microstructure Evolution of AE81 Magnesium Alloy during Rolling

作　　者：武红飞 胡文鑫[1] 马少博[1] 杨正华[1] 王玮 刘峰 何伟 WU Hongfei;HU Wenxin;MA Shaobo;YANG Zhenghua;WANG Wei;LIU Feng;HE Wei(State Key Laboratory of Baiyunobo Rare Earth Resource Researches and Comprehensive Utilization,Baotou Research Institute of Rare Earths,Baotou 014030,China)

机构地区：[1]包头稀土研究院白云鄂博稀土资源研究与综合利用国家重点实验室,内蒙古包头014030

出　　处：《热加工工艺》2024年第11期129-133,共5页Hot Working Technology

基　　金：内蒙古自治区科技计划项目(2020GG0318)。

摘　　要：通过重力铸造法制备了AE81稀土镁合金,并对固溶处理后的合金在300℃和350℃进行压下量分别为15%、20%、25%和30%的轧制变形。结果表明:稀土元素Ce的加入导致铸态组织中Mg_(17)Al_(12)相不连续分布,镁基体上分布的Al4Ce相以块状形貌、中空管状形貌和针状形貌存在。轧制变形后,AE81合金所产生的变形组织的体积分数随着压下量的增大而增大,当压下量增大到25%时出现了明显的动态再结晶现象,再结晶晶粒的平均尺寸主要分布在200~400nm之间,且动态再结晶区域主要分布在Al_(4)Ce相周围。同时,Mg_(17)Al_(12)析出相的体积分数随着轧制温度和压下量的增大而增大,Mg_(17)Al_(12)相在基体上的分布得到改善。AE81 rare earth magnesiumalloy was prepared by gravity casting method,and the alloy after solution treatment was subjected to rolling deformation at 300℃and 350℃for 15%,20%,25%and 30%,respectively.The results show that the addition of rare earth element Ce causes the discontinuous distribution of Mg_(17)Al_(12) phase in the as-cast microstructure,and the Al4Ce phase in the magnesiummatrix exists in the shape of block,hollowtube and needle.After rolling deformation,the volume fraction of the deformed microstructure in AE81 alloy increases with the increase of the reduction amount.When the reduction amount increases to 25%,obvious dynamic recrystallization phenomenon occurs.The average size of the recrystallized grains is mainly distributed between 200 nmand 400 nm,and the dynamic recrystallization region is mainly distributed around the Al_(4)Ce phase.Meanwhile,the volume fraction of Mg_(17)Al_(12) precipitated phase increases with the increase of rolling temperature and reduction,and the distribution of Mg_(17)Al_(12) phase on the matrix is improved.

关 键 词：AE81镁合金 轧制 显微组织 

分 类 号：TG335[金属学及工艺—金属压力加工]