Effect On Aluminum Alloy Properties Processed By Chemical Milling In Li-ion Dissolved Chemical Milling Fluid

Chemical Milling is a kind of processing technique by exposing themetallic parts to the chemical medium and corroding the part needingprocessing. The needed size and accuracy of the part can be obtained bycorroding the pre-defined region. Chemical milling process is with theadvantage of without tool, no chip and residual cutting stress. Therefore,it can be used to process special thin, easy-deforming and large-areacomponent, and aluminum alloy chemical milling is an important andindispensable technology in modern aircraft and weapon equipmentdevelopment.Sodium hydroxide solution was used for chemical milling ofaluminum lithium alloy uses the。This experiment has been configuratedordinary milling fluid, milling fluid of containing lithium-ion，then the2024and7075two ordinary aluminum alloy process chemical milling intwo different chemical milling fluid that is on the same experimentcondition。 Microstructure of matrix materials, ordinary chemical milledmaterials and Li-ion containing chemical milled materials of the twokinds of aluminum alloy was observed by metallographic microscope.Miniature electronic tensile machine was used for the contrast of tensileproperties for the three conditions of the two kinds of aluminum alloy.Spectrum analyzer was used for the lithium element composition analysisand measurement.The experiment results show that the surface roughness reducedafter milling, Chemical milling affect the microstructure and properties ofthe alloy. Tensile curve of2024aluminum alloy did not change greatlybefore milling. However, it changed obviously for the7075alloy afterchemical milling, and the yield strength decreases. After lithium-ioncontaining chemistry milling the yield strength slightly increases and theplasticity decreases. The fatigue property of the Al alloys deduces insome extent after chemical milling processing. The spectrum analyzermeasurement showed that treated by lithium-ion containing chemistry milling, lithium-ion diffused into the inside of the alloys and makeslithium density increases. Li element strengthen the alloy.