Effect of Li Content on Properties and Microstructure Evolution of Near-Rapid Solidified 2A97 Al-Li Alloy

IMR OpenIR

	Effect of Li Content on Properties and Microstructure Evolution of Near-Rapid Solidified 2A97 Al-Li Alloy
其他题名	Effect of Li Content on Properties and Microstructure Evolution of Near-Rapid Solidified 2A97 Al-Li Alloy
	Tang Yingchun 1; Luo Lei 1; Luo Liangshun 1; Liu Yulin 2; Xu Yanjin 3; Su Yanqing 1; Guo Jingjie 1; Fu Hengzhi 1
	2019
发表期刊	RARE METAL MATERIALS AND ENGINEERING
ISSN	1002-185X
卷号	48 期号:9 页码:2737-2744
摘要	2A97 Al-Li alloys with different Li contents were cast by the near-rapid solidification. After that, physical properties analysis was performed by tensile and density tests. Simultaneously, the differential scanning calorimeter (DSC), optical microscope (OM), scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to explore the microstructure evolution of the Al-Li alloy. The results show that 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 significance 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, the petal-shaped eutectic phase Al2CuMg appears. Besides, 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, as the Li content increases from 1.5 wt% to 3.5 wt%, the effect of the heat treatment decreases sharply, resulting in many coarse eutectic phases remaining in the triangular cross boundaries of the alloy and a reduction in mechanical properties of alloys.
其他摘要	2A97 Al-Li alloys with different Li contents were cast by the near-rapid solidification.After that,physical properties analysis was performed by tensile and density tests.Simultaneously,the differential scanning calorimeter (DSC),optical microscope (OM),scanning electron microscope (SEM) and energy dispersive spectrometer (EDS) were used to explore the microstructure evolution of the Al-Li alloy.The results show that 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 significance 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 Al_2CuLi phase.Accompanied by the relative decrease of Al_2Cu phase,the petal-shaped eutectic phase Al_2CuMg appears.Besides,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,as the Li content increases from 1.5 wt% to 3.5 wt%,the effect of the heat treatment decreases sharply,resulting in many coarse eutectic phases remaining in the triangular cross boundaries of the alloy and a reduction in mechanical properties of alloys.
关键词	HOMOGENIZATION PRECIPITATION CORROSION 2A97 Al-Li alloys near-rapid solidification ultra-low-density Al-Li alloys petal-shaped eutectic phase
收录类别	CSCD
语种	英语
资助项目	[National Natural Science Foundation of China] ; [National Key Research and Development Program of China]
CSCD记录号	CSCD:6574771
引用统计
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/141760
专题	中国科学院金属研究所
作者单位	1.Harbin Institute Technol, Natl Key Lab Precis Hot Proc Met, Harbin 150001, Heilongjiang, Peoples R China 2.中国科学院金属研究所 3.AVIC Mfg Technol Institute, Beijing 100024, Peoples R China
推荐引用方式 GB/T 7714	Tang Yingchun,Luo Lei,Luo Liangshun,et al. Effect of Li Content on Properties and Microstructure Evolution of Near-Rapid Solidified 2A97 Al-Li Alloy[J]. RARE METAL MATERIALS AND ENGINEERING,2019,48(9):2737-2744.
APA	Tang Yingchun.,Luo Lei.,Luo Liangshun.,Liu Yulin.,Xu Yanjin.,...&Fu Hengzhi.(2019).Effect of Li Content on Properties and Microstructure Evolution of Near-Rapid Solidified 2A97 Al-Li Alloy.RARE METAL MATERIALS AND ENGINEERING,48(9),2737-2744.
MLA	Tang Yingchun,et al."Effect of Li Content on Properties and Microstructure Evolution of Near-Rapid Solidified 2A97 Al-Li Alloy".RARE METAL MATERIALS AND ENGINEERING 48.9(2019):2737-2744.