AZ31B镁合金焊接头显微组织及织构演化研究  

Study on Microstructure and Texture Evolution of AZ31B Magnesium Alloy Welded Joints

作　　者：刘洪涛[1] 王若超[2] 周吉学[1] 陈燕飞[3] 庄海华[3] LIU Hongtao WANG Ruochao ZHOU Jixue CHEN Yanfei ZHUANG Haihua(Shandong Key Laboratory for High Strength Lightweight Metallic Materials, Advanced Materials Institute, Shandong Academy of Sciences, Jinan 250014, China Shandong Institute of Commerce and Technology, Jinan 250103, China Shandong Engineering Research Center for Lightweight Automobiles Magnesium Alloys, Advanced Materials Institute, Shandong Academy of Sciences, Jinan 250014, China)

机构地区：[1]山东省科学院新材料研究所山东省轻质高强金属材料省级重点实验室(筹),山东济南250014 [2]山东商业职业技术学院,山东济南250103 [3]山东省科学院新材料研究所山东省汽车轻量化镁合金材料工程技术研究中心,山东济南250014

出　　处：《铸造技术》2017年第4期906-909,共4页Foundry Technology

基　　金：山东省自然科学基金(ZR2015EQ019;BS2015CL016);山东省科学院青年基金(2016QN015)

摘　　要：采用先进的六轴焊接机器人对AZ31B变形镁合金进行了焊接实验研究。利用扫描电子显微镜和电子背散射对焊接接头的微观组织形貌、硬脆性沉淀相及织构演化规律等进行了表征分析。结果表明,焊接接头可明显分为母材区、热影响区和焊接熔化区,焊接熔化区呈现出了典型的铸态枝晶组织。由于在焊接过程中焊接区发生了非平衡态凝固过程,生成了大量的β-Mg17Al12硬脆性中间相。母材区呈现出了典型的{0001}<10-10>轧制强板织构,而熔化区织构则演变为{01-11}和{11-2L}型锥面织构。AZ31B magnesium alloys were welded by a six-axis robot. The microstructure, precipitated phases and texture evolution of AZ31B joints were studied by scanning electron microscope（SEM） and electron backscatter diffraction（EBSD）. The results show that the microstructure of AZ31 auto-welded joints consists of base metal （BM）, heat affected zone（HAZ）, and fusion zone （FZ）. The typical casting dendrites can be observed in FZ. Owing to non-equilibrium solidification process, a large amount of hard β-Mg17Al12 phases are formed in FZ. The typical basal texture {0001}〈10-10〉 is detected in BM. While, {01-11} and {11-2L} pyramidal texture is observed in FZ.

关 键 词：AZ31B镁合金 自动弧焊 显微结构 EBSD 织构 

分 类 号：TG457.1[金属学及工艺—焊接]