Microstructure and texture characterization in Nd:YAG laser welds of 5A90 Aluminum-Lithium (Al-Li) alloys were studied by means of optical microscope (OM),electron back scattered diffraction (EBSD) and transmission electron microscope (TEM).The solidification structure,misorientation angle,dislocation density and microtexture of the welds in 5A90 Al-Li alloys were investigated and compared with the unaffected base metal.The results show that microstructure and texture changes of the 5A90 Al-Li alloy after laser welding.The solidification structure results show that a zone of equiaxed grains (EQZ) along the fusion boundary is formed and the weld metal exhibits entirely equiaxed dendritic grains for 5A90 Al-Li alloy.EBSD study clearly shows the high angle boundaries (>15°) and microtexture changes for 5A90 Al-Li alloy after laser welding.TEM images indicate that the laser welding has no influence on the dislocation density.
Cui Li1,Li Xiaoyan1,He Dingyong1,Chen Li2,Gong Shuili21College of Materials Science and Engineering,Beijing University of Technology,Beijing 100124,China2Science and Technology on Power Beam Processes Laboratory,Beijing Aeronautical Manufacturing Technology Research Institute,Beijing 100024,China
