Abstract: The chemical composition and process design of aluminum-lithium(Al-Li) alloy directly affect their microstructural distribution and overall service performance.The spray-formed aluminum alloy employs a relatively advanced smelting process,but the settings of its process parameters can significantly affect the composition distribution of the ingot.Consequently,the quantitative characterization of chemical composition distribution for spray-formed Al-Li alloy is of great significance for guiding the smelting processes.In this study,an in-situ quantitative statistical distribution characterization method for the composition of spray-formed 2195 Al-Li alloy was established based on microbeam X-ray fluorescence spectrometry(μ-XRF).Nondestructive in-situ quantitative distribution characterization was conducted for 5 major elements in 2195 Al-Li alloy,including Cu,Fe,Mg,Zr and Ag.The distribution regularity of each element from the core to the edge of ingot was systematically investigated.The results indicated that Cu exhibited obvious enrichment at the edge,followed by a secondary enrichment in the core region,while spot segregation was observed for both Fe and Mg.Continuous fixed-point analysis via spark discharge optical emission spectrometry(Spark-OES) further verified that the contents of Cu at the edge and core of the ingot were higher than that at the r/4 region (where r denotes the ingot radius),which was consistent with the quantitative distribution results obtained by μ-XRF.Scanning electron microscopy and energy dispersive spectroscopy(SEM/EDS) were also employed for the characterization of microstructures at different regions of ingot.Copper-rich phases were identified,which further clarified the formation mechanism of elemental segregation in the ingot.The in-situ quantitative statistical distribution analysis method based on μ-XRF had important significance for the detailed inspection and quality evaluation of spray-formed processes,and it was crucial for exploring and revealing the correlation among composition,microstructure and properties of spray-formed Al-Li alloy.