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陈向荣,郑子樵,叶志豪,孔祥.2099铝锂合金搅拌摩擦焊接接头微观组织研究[J].稀有金属材料与工程(英文),2018,47(6):1786~1792.[Chen Xiangrong,Zheng Ziqiao,Ye Zhihao and Kong Xiang.Microstructural characterization of friction stir welded 2099 Al-Li alloy[J].Rare Metal Materials and Engineering,2018,47(6):1786~1792.]
Microstructural characterization of friction stir welded 2099 Al-Li alloy
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Received:May 17, 2016  Revised:August 21, 2016
Key words: Al-Li alloy  Friction stir weld  EBSD
Foundation item:2012CB619503;2013AA032401
Author NameAffiliation
Chen Xiangrong,Zheng Ziqiao,Ye Zhihao and Kong Xiang  
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      A friction stir welded 2099-T83 extruded Al-Li alloy has been characterized in terms of microstructure and crystallographic texture. Optical microscopy, scanning electron microscopy and transmission electron microscopy were applied to investigate the microstructure and hardness. Hardness test revealed the W-shaped profile in weld zone and reach to minimum in HMAZ. Base metal shows a partial recrystallization with T1 phase and δ′ phase in grain and grain boundary. The grain size in welding zone is smaller than base metal,and the precipitates what observed in base metal dissolved and transformed into δ′ phase in welding zone. Furthermore crystallographic texture analysis by electron backscatter diffraction indicated that the base metal exist {112}<111>copper ,{123}<634>S and {001}<100> cube texture. The nugget zone presented {001}<110> rotated-cube texture as it experienced dynamic recrystallization. The thermo-mechanically affected zone and heat affected zone are dominated by {112}<110> and {112}<111>texture respectively , and both of them exist the weak {001}<120> texture.