Ce对Al-Mg-Si合金铸态及均匀化组织的影响  

Effects of Ce on As-cast and Homogenization Microstructure of Al-Mg-Si Alloy

作　　者：余海东 茹中赟 李勇[1,2,3] 邓同生 刘锦平 邓庚凤[1,2] 张亦杰 Yu Haidong;Ru Zhongyun;Li Yong;Deng Tongsheng;Liu Jinping;Deng Gengfeng;Zhang Yijie(Faculty of Materials Metallurgy and Chemistry,Jiangxi University of Science and Technology;Dongliang Aluminum Industry Co.,Ltd.;Key laboratory of Advanced Metal and Functional Materials of Ganzhou)

机构地区：[1]江西理工大学材料冶金化学学部 [2]栋梁铝业有限公司 [3]赣州市先进金属及功能材料重点实验室

出　　处：《特种铸造及有色合金》2023年第2期229-235,共7页Special Casting & Nonferrous Alloys

基　　金：湖州市2020年度“南太湖精英计划”资助项目(2020STEP21003)。

摘　　要：采用光学显微镜、X射线衍射仪、扫描电镜及能谱分析仪研究了微量Ce对Al-Mg-Si合金的铸态及其均匀化组织的影响。结果表明,稀土元素Ce可以明显地细化合金的铸态组织。当合金中添加0.2%的Ce时,晶界上存在富Ce的金属化合物,Ce有效抑制了初生相的形核和长大。经490℃×24 h均匀化处理后,合金中的非平衡相未回溶到基体中,仍存在大量的枝晶组织;随着均匀化温度提高,枝晶和非平衡相消失,基体合金中残留片状的AlFeSi相,Ce使粗大的AlFeSi相转变为颗粒状、短棒状的富Ce的AlFeSi相。Effects of trace Ce on as-cast and homogenized microstructure were investigated by optical microscope, XRD, scanning electron microscope and EDS analysis. The results indicate the rare earth element Ce can significantly refine the as-cast microstructure of the alloy. With adding 0.2% Ce, Ce-rich that compounds exist on the grain boundaries, and the rare earth element Ce can effectively inhibit the nucleation and growth of the primary phase. After the homogenization treatment at 490 ℃ for 24 h, the non-equilibrium phase in the alloy can’t diffuse back into the matrix, and a large number of dendrites still remain. With the increase of homogenization temperature, the dendrite and non-equilibrium phase disappear, and the flaky AlFeSi phase remain in the matrix. The coarse AlFeSi phase is transformed into the granular, short rod-shaped Ce-rich phase due to rare earth element Ce.

关 键 词：CE AL-MG-SI合金 铸态组织 均匀化 第二相 

分 类 号：TG146.21[一般工业技术—材料科学与工程] TG156[金属学及工艺—金属材料]