电子背散射衍射技术在Mg/Al金属焊接中的应用  

The Application of EBSD Technology in the Research of the Mg / Al Alloy Welding

作　　者：周莹[1] 王虎[1] 吴伟[2] 曾毅[2] 

机构地区：[1]上海市计量测试技术研究院,上海201203 [2]中国科学院上海硅酸盐研究所,上海200050

出　　处：《实验室研究与探索》2016年第1期27-30,84,共5页Research and Exploration In Laboratory

基　　金：上海市质量技术监督局科研项目(I00RJ1414)

摘　　要：电子背散射衍射(EBSD)可以提供晶体结构、晶体取向、相分布及鉴别、晶界、应力应变分析等信息,是有效的材料分析方法。离子束截面抛光具有无剪切应力残留,无磨料污染,无划痕,试样损伤小等优点,适合于Mg/Al异种金属焊接层试样的制备。利用EBSD可以快速准确地观察Mg/Al异种金属焊接层母材Al相、Al侧过渡区、扩散区的晶粒形状、尺寸及分布情况。根据Mg/Al异种金属焊接层各相的EBSD菊池衍射花样及能谱的定性定量结果,实现了对焊接层的相鉴定、织构、晶界角的分析。Electron channeling contrast imaging and electron back-scattering diffraction can provide the crystal structure,crystal orientation,phase distribution and identification,grain boundary,stress analysis and other information,hence,they are effective methods for analysis of materials. Ion cross-sections milling has the advantages of no shear stress residual,no abrasive contamination,no scratches,and small sample damage,therefore,it is suitable for the specimen preparation of Mg / Al dissimilar alloy welding layer. The grain shape,size and distribution of the base material Al,Al transition zone,and diffusion zone of Mg / Al dissimilar metal welding layer can be observed rapidly and accurately by EBSD. According to the Kikuchi diffraction patterns of EBSD and the qualitative and quantitative results of EDS in each phase of the specimen,phase identification,texture,and grain boundary angle of the welding layer can be analyzed.

关 键 词：场发射扫描电镜 电子背散射衍射 离子束截面抛光 相鉴定 

分 类 号：TN16[电子电信—物理电子学]