Metallographic sample preparation of Ti₃Al alloy laser welded joints for EBSD

Research of the microstructure and texture of laser welded joints of Ti₃Al based alloy plays an important role in improving the properties of the joints,while the technique of electron backscatter diffraction(EBSD) is an attractive method in the research.The quality of metallographic sample had great effect on the accuracy of testing results,and three methods to prepare the EBSD sample of Ti₃Al alloy laser welded joints were investigated.The experiments indicated that chemo-mechanical polishing was more suitable to the sample preparation of Ti₃Al alloy laser welded joints than ion milling or electrolytic polishing.It has many advantages such as simple equipments,easy operation and precision results,especially for the Ti₃Al alloy laser welded joints whose base material,HAZ and weld have different microstructure.