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Method for displaying EQZ (Equiaxed Grain Zone) textures of welded joints and fusion zones of 5A90 aluminum-lithium alloy laser welding

An aluminum-lithium alloy and laser welding technology, which is applied in the field of material analysis, can solve problems that do not involve process parameters, steps or key points, different proportions of electrolytic polishing liquid, and failure to provide grain orientation imaging maps, etc., achieving simple equipment, The effect of easy operation

Inactive Publication Date: 2012-06-20
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there has not been any patent literature on the application of EBSD technology to analyze the EQZ of Al-Li alloy welded joints, but there is an article using EBSD micro-orientation imaging (OIM) technology to study 2195 Al-Li alloy Report on the Formation Mechanism of Heat Affected Zone EQZ of Tungsten Argon Arc (TIG) Welding Joint
The difference between this application and this thesis lies in: (1) The material alloy system studied is different from the welding method. The 2195 alloy belongs to the Al-Cu-Li series aluminum-lithium alloy, and the 5A90 alloy is the Al-Mg-Li series aluminum-lithium alloy. The welding method in this paper is TIG welding, while this application is laser welding; (2) the ratio of electrolytic polishing liquid is different. The volume ratio of nitric acid and methanol in the polishing liquid mentioned in the paper is 1: 3, and the ratio of this application is 3 : 7; (3) The process parameters, steps or key points of EBSD sample preparation by electrolytic polishing described in this application are not involved in the paper; (4) The grain orientation of EQZ is only provided in the paper, but the entire joint is not provided (including base metal, EQZ and weld structure) grain orientation imaging

Method used

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  • Method for displaying EQZ (Equiaxed Grain Zone) textures of welded joints and fusion zones of 5A90 aluminum-lithium alloy laser welding
  • Method for displaying EQZ (Equiaxed Grain Zone) textures of welded joints and fusion zones of 5A90 aluminum-lithium alloy laser welding

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Experimental program
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Effect test

Embodiment 1

[0022] The horizontal section of the 5A90 aluminum-lithium alloy laser welded joint was sampled by wire cutting, and first mechanically polished: after cleaning with alcohol in an ultrasonic cleaner, the samples to be tested were passed through 200#, 400#, 600#, 800#, 1000# , 1200#, 1500#, 2000# water sandpaper for rough grinding, and then use woolen and polishing paste to polish until the surface of the sample is bright without scratches. Use an ultrasonic cleaner to clean in acetone solution for about 10 minutes, take out the sample, clean it with alcohol, dry it with a hair dryer, and then perform electrolytic polishing. The polishing solution is a mixed solution of nitric acid and methanol with a volume ratio of 3:7. The DC voltage is 20V, the polishing temperature is -25°C, the current is 1.0A, the polishing time is about 60s, and the electrolytic polishing is stirred with a glass rod. After the electropolished samples were cleaned by ultrasonic deionization in alcohol, t...

Embodiment 2

[0024] The cross-section of the 5A90 aluminum-lithium alloy laser welded joint was sampled by wire cutting, and first mechanically polished: after cleaning with alcohol in an ultrasonic cleaner, the samples to be tested were passed through 200#, 400#, 600#, 800#, 1000# , 1200#, 1500#, 2000# water sandpaper for rough grinding, and then use woolen and polishing paste to polish until the surface of the sample is bright without scratches. Use an ultrasonic cleaner to clean in acetone solution for about 10 minutes, take out the sample, clean it with alcohol, dry it with a hair dryer, and then perform electrolytic polishing. The polishing solution is a mixed solution of nitric acid and methanol with a volume ratio of 3:7. The DC voltage is 20V, the polishing temperature is -25°C, the current is 1.0A, the polishing time is about 60s, and the electrolytic polishing is stirred with a glass rod. After the electropolished samples were cleaned by ultrasonic deionization in alcohol, they w...

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Abstract

The invention discloses a method for displaying EQZ (Equiaxed Grain Zone) textures of welded joints and fusion zones of 5A90 aluminum-lithium alloy laser welding, belonging to the technical field of material analysis. The method comprises the following steps of mechanical polishing of a joint sample, preparation of electrolytes, electrolytic polishing, EBSD (Electron Back Scattering Diffraction) test and the like. The method disclosed by the invention has the advantages of successfully solving the difficult problem of displaying the EQZ textures of the welded joints and the fusion zones of the 5A90 aluminum-lithium alloy laser welding, and clearly displaying the characteristics, such as form, size and grain orientation, of the EQZ textures of the welded joints and the fusion zones of the 5A90 aluminum-lithium alloy laser welding. The method disclosed by the invention has the advantages of simpleness in equipment, convenience for operation, and capability of being applied to observation of the EQZ textures of fusion zones of various types of aluminum alloy welded joints.

Description

technical field [0001] The invention relates to a method for displaying the microstructure of aluminum-lithium alloy welded joints. The grain orientation imaging image using electron backscatter diffraction (Flectron Back Scatter Diffraction, EBSD) technology directly displays the equiaxed weld seam and fusion zone of 5A90 aluminum-lithium alloy laser welding The morphology and grain orientation of non-dendritic equiaxed grain zone (EQZ) involves the intersection of different research fields such as welding technology, metallurgy and material analysis, and belongs to the field of material analysis technology. Background technique [0002] Aluminum-lithium alloy is a new type of lightweight structural material, which is widely used in the aerospace field. Welding aluminum-lithium alloy structural parts can reduce structural weight, improve structural rigidity, and save assembly time. Therefore, welding technology is of great significance for expanding its application. So far...

Claims

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Application Information

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IPC IPC(8): G01N23/203G01N23/207G01N1/32
Inventor 崔丽李小延贺定勇王智慧魏琪蒋建敏
Owner BEIJING UNIV OF TECH
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