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《Aeronautical Science & Technology》 2020-01
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Study on Influence of Laser Remelting on Copper Segregation Behavior and Corrosion Property of 2098 Al-Li Alloy

Lei Xiaowei;Xue Boyu;Muyeser·Tilwaldi;Wang Nan;Northwestern Polytechnical University;School of Materials Science and Engineering,Shaanxi University of Technology;  
Grain Boundary(GB) copper segregation is inevitable for Al-Li alloys during laser remelting. Copper segregation may significantly influence the microstructure and corrosion property of Al-Li alloys. In the present study,laser remelting technique was employed to obtain laser-remelted structure on 2098 Al-Li alloy. Scanning electron microscopy and energy dispersive spectroscopy were used to characterize the microstructure of laser remelted zone and the feature of copper segregation. Immersion test was conducted to analyze the corrosion behavior of laserremelted Al-Li alloy. It is found that the upper surface of laser-remelted Al-Li alloy can be symmetrically divided into three parts: the columnar grain zone in the center of the weld, equiaxed grain zone at the edge of welding pool, and columnar grain zone in between the center and the edge of the weld. The GB copper content increases from the center to the edge. With a laser scanning speed of 5 mm/s, the amount of GB copper content could reach to 21 wt.%,while it is around 9 wt.% at the center of the weld. The corrosion resistance of laser remelted Al-Li alloy declined with the increase of GB copper segregation.
【Fund】: 航空科学基金(2017ZF53066);; 国家自然科学基金(51801160)~~
【CateGory Index】: TG456.7
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