Quantitative Analysis Technology And Application Of Second Phase Of 8××× Series Aluminum Foil Based On MATLAB

The foil made of 8×××series aluminum alloy materials have the advantages of high strength and good formability,and have become the main alloy system for producing ultra-thin double-zero aluminum foil.However,the high content of Fe and Si in 8×××aluminum alloys leads to a large number of second phases and complicated composition.Therefore,the second phase becomes the most important factor affecting the quality of 8×××double-zero aluminum foil products.However,there are few studies on the variation of the second phase of 8×××series double-zero aluminum foil,and most of them are concentrated on the billet.Therefore,the quantitative analysis of the variation of the type,shape,size and quantity of the second phase of the 8×××series double zero aluminum foil in the entire process flow is of great significance to the production guidance of the enterprise.In this paper,based on the image processing function of MATLAB,the second phase images of aluminum foil was processed to obtain the corresponding test parameters.The images taken by OM,SEM,EDS and other technical means were statistically identified,and three different Fe/Si mass ratios were studied.The size,type and distribution number of the second phase of the 8×××series double-zero aluminum foil in the whole process,and discussed the influence of Fe/Si ratio on the second phase.From the analysis of the second-phase images of different types of aluminum foil,it was found that the SEM image should be cropped first,the images are all linearly gray-scale transformed for image enhancement,and wiener filtering is used to remove noise.Therefore,this paper choosed three methods of image segmentation:Sobel operator,closed operation and hole filling method;Otsu segmentation,erosion method;mixed segmentation method.The roundness of the second phase in the image was extracted as a characteristic element,and the second phase was recognized as needle-shaped,elliptical-grained or round-grained.Based on the MATLAB GUI interface design,a second phase quantitative identification system for aluminum foil was developed.The system had the advantages of friendly human-computer interaction,fast image processing,and accurate second phase quantification.After observing and analyzing the structure of 8×××series double-zero aluminum foil through the second phase quantitative identification system of aluminum foil,it was found that there were some fluctuations in the second phase area ratio of 8×××series double-zero aluminum foil in the 12 processes from cast and rolled sheet to finished aluminum foil,but the change was not large;When the Fe/Si ratio was 1.2?AA8111?,the area ratio of the second phase was from12.46%?cast-rolled sheet?to 10.03%?finished aluminum foil?;The increase of Fe/Si mass ratio had a very large effect on the area ratio of the second phase;When the Fe/Si ratio was 6.4?AA8079?,the area ratio of the second phase was from22.18%?cast-rolled sheet?to 23.27%?finished aluminum foil?;When the Fe/Si ratio was 12.1?AA8021?,the area ratio of the second phase was from 31.49%?cast rolled plate?to 30.75%?finished aluminum foil?;8×××series of double zero aluminum foil small particles?size?4?m?due to phase breaking during rolling and phase dissolution during annealing,the relative content of the second phase would change greatly in the entire process.As the Fe/Si mass ratio increases,the relative content of the second phase of small particles becomes larger and larger;When the Fe/Si ratio was1.2?AA8111?,the relative content of the small particle phase increased from35.3%?cast-rolled sheet?to 39%?finished aluminum foil?;When the Fe/Si ratio was6.4?AA8079?,the relative content of the small particle phase increased from40.58%?cast-rolled sheet?to 47.2%?finished aluminum foil?;When the Fe/Si ratio was 12.1?AA8021?,the relative content of the small particle phase increased from44.25%?cast rolled sheet?to 64.83%?finished aluminum foil?.When the Fe/Si ratio was 1.2?AA8111?,the second phase was mainly??AlFeSi?phase,??AlFeSi?phase would undergo a certain amount of crushing during billet rolling and small particle??AlFeSi?phase would occur Re-dissolved,and the??AlFeSi?phase was basically not broken during foil rolling;When the Fe/Si ratio was 6.4?AA8079?,the second phase was dominated by the??AlFeSi?phase.The??AlFeSi?phase would be broken in the entire process,and The phenomenon that the??AlFeSi?phase of small particles was dissolved and spheroidized was more obvious;When the Fe/Si ratio was12.1?AA8021?,the second phase was dominated by the??Al₃Fe?phase.The??Al₃Fe?phase was prone to fracture and breakage in the entire process,but the??Al₃Fe?phase of small particles was very difficult to dissolve during the process.