Microstructure and Texture Characterization in Nd:YAG Laser Welds of 5A90 Aluminum-Lithium Alloys  

作　　者：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 

出　　处：《稀有金属材料与工程》2011年第S4期39-43,共5页Rare Metal Materials and Engineering

基　　金：Foundation item:Aeronautical Science Foundation of China(20085475003)

摘　　要：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.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.

关 键 词：laser WELDING AL-LI ALLOY microstructure TEXTURE EBSD 

分 类 号：TG456.7[金属学及工艺—焊接]