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,2019,48(9):2737~2744.[Tang Yingchun,Luo Lei,Luo Liangshun,Liu Yulin,Xu Yanjin,Su Yanqing,Guo Jingjie,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.]
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
投稿时间:2018-04-02  修订日期:2018-05-16
中文关键词:  2A97 Al-Li 合金  亚快速凝固  超低密度铝锂合金  花瓣状共晶相
基金项目: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)
中文摘要:
      通过亚快速凝固技术铸造2A97Al-Li合金,借助密度和拉伸测试对合金性能进行分析。同时,利用差热分析(DSC),光学电镜(OM),扫描电镜(SEM)及能谱分析(EDS)对合金显微组织演变进行研究。结果表明:通过亚快速凝固技术和合理的热处理工艺可以有效减少2A97 Al-Li合金中存在的粗大第二相,这对于超低密度Al-Li合金的实现具有十分重要的意义。随着合金中Li含量的增加,Cu原子更倾向于捕获Li原子而形成Al2CuLi相;同时,Al2Cu相相对减少,并出现花瓣状共晶相Al2CuMg;另外,亚快速凝固Al-Li合金的铸态显微组织由树枝晶向胞状晶转变,并促进晶粒细化。然而,随着Li含量由1.5 wt. %升到3.5wt. %过程中,热处理的效果逐渐降低,导致粗大共晶相残留于合金的三角叉晶界处,合金力学性能降低。
Effect of Li content on the properties and microstructure evolution of near-rapid solidified 2A97 Al-Li Alloy
英文关键词:2A97 Al-Li alloys  near-rapid solidification  ultra-low-density Al-Li alloys  petal-shaped eutectic phase
英文摘要:
      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.
作者单位E-mail
唐迎春 哈尔滨工业大学,材料科学与工程学院,金属精密热加工国家级重点实验室 tangyingchunhit@163.com 
罗磊 哈尔滨工业大学 luolei51jiayou@163.com 
骆良顺 哈尔滨工业大学  
刘玉林 沈阳航空航天大学,材料科学与工程学院  
徐严谨 中航工业制造技术研究院  
苏彦庆 哈尔滨工业大学  
郭景杰 哈尔滨工业大学  
傅恒志 哈尔滨工业大学  
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