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唐迎春,罗磊,骆良顺,刘玉林,徐严谨,苏彦庆,郭景杰,傅恒志.Li含量对亚快速凝固2A97铝锂合金的性能及组织演变规律的影响[J].稀有金属材料与工程(英文),2019,48(9):2737~2744.[Tang Yingchun,Luo Lei,Luo Liangshun,Liu Yulin,Xu Yanjin,Su Yanqing,Guo Jingjie and Fu Hengzhi.Effect of Li content on the properties and microstructure evolution of near-rapid solidified 2A97 Al-Li Alloy[J].Rare Metal Materials and Engineering,2019,48(9):2737~2744.]
Effect of Li content on the properties and microstructure evolution of near-rapid solidified 2A97 Al-Li Alloy
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Received:April 02, 2018  Revised:May 16, 2018
DOI:
Key words: 2A97 Al-Li alloys  near-rapid solidification  ultra-low-density Al-Li alloys  petal-shaped eutectic phase
Foundation item:国家自然科学基金项目(面上项目,重点项目,重大项目),国家重点基础研究发展计划(973计划)
Author NameAffiliation
Tang Yingchun,Luo Lei,Luo Liangshun,Liu Yulin,Xu Yanjin,Su Yanqing,Guo Jingjie and Fu Hengzhi  
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Abstract:
      2A97 Al-Li alloys with different Li contents have been cast by the near-rapid solidification. After that, perform physical properties analysis by means of tensile and density tests. Simultaneously, use the differential scanning calorimeter (DSC), optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) to explore the microstructure evolution of the Al-Li alloy. The results show that through the near-rapid solidification and a reasonable heat treatment process can effectively reduce the coarse second phase in the 2A97 Al-Li alloy, which is of great interest for obtaining ultra-low-density Al-Li alloys. With the increase of Li content, the Cu element in the alloy is more inclined to capture more Li element to form the Al2CuLi phase. Accompanied by the relative decrease of Al2Cu phase and the appearance of the petal-shaped eutectic phase Al2CuMg. Not only that, the as-cast microstructure of the near-rapid solidified Al-Li alloy transforms from dendritic grains to cellular-like grains, leading to the refinement of the grains. However, with the Li content from 1.5 wt. % to 3.5wt. %, the effect of the heat treatment decreases sharply, resulting in many coarse eutectic phases remaining in the triangular cross boundaries of the alloy and the reduction of alloy mechanical properties.