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Preparation method for metallic phase sample of 1060 aluminium plate and MB3 magnesium alloy palate join

A technology for metallographic samples and magnesium alloy plates, applied in the field of material welding, can solve problems such as pits, difficulties in metallographic sample preparation, inability to accurately focus, etc., to achieve easy analysis, clear metallographic samples, and overcome over-corrosion. Effect

Inactive Publication Date: 2007-09-12
王训宏
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the friction stir welded joints of dissimilar materials have great differences in plasticity, toughness, hardness, melting point, corrosion resistance and other properties of the welded materials, so it brings many difficulties to the preparation of metallographic samples of friction stir welded joints.
For example, it is easy to have steps at the joint surface during grinding and polishing, and such a sample will not be able to focus accurately when taking metallographic photos; due to the different physical properties of the materials, it is impossible to choose a method that can meet the requirements of several metals at the same time during etching. The etchant and etching time required for etching, especially in the joint area; some metals cannot be electrolytically polished, otherwise pits will be formed; sometimes due to the difference in the properties of the material components themselves, some components have been etched while others Yuan has not been polished and so on

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1. Sampling

[0039] The welded joints of the 1060 aluminum plate and the MB3 magnesium alloy are cut into samples with a side length of 18mm and a height of 15mm with a grinding wheel slicer or a wire cutting machine.

[0040] 2. Grinding

[0041] (1) Coarse grinding

[0042] Roughly grind the sample prepared in step 1 with a grinder or file.

[0043] (2) fine grinding

[0044] After rough grinding, the grinding surface of the sample is manually finely ground with metallographic sandpaper or water sandpaper.

[0045] 3. Polishing

[0046] (1) Polishing machine for polishing

[0047] Polish the finely ground sample with a polishing machine. When polishing, wet the polishing fabric with water, spread it tightly and fix it on the polishing disc of the polishing machine, and sprinkle diamond polishing liquid with a particle size of 6um on the polishing disc. When the polishing fabric is wet, it is necessary to add an appropriate amount of diamond polishing liquid or ...

Embodiment 2

[0067] In the process steps of this embodiment, the welded joint between the 1060 aluminum plate and the MB3 magnesium alloy is cut into a sample with a side length of 15 mm and a height of 12 mm with a grinding wheel slicer or a wire cutting machine. In polishing step 3, the finely ground sample is polished with a polishing machine. During polishing, the polishing fabric is soaked with water, paved and tightened and fixed on the polishing disc of the polishing machine, and the diamond polishing liquid with a particle size of 1um is Sprinkle on the polishing disc until the polishing fabric is wet. When polishing, add an appropriate amount of diamond polishing liquid or water to maintain the humidity of the polishing disc. The pressure head of the polishing machine is 80 Newtons, and the speed of the polishing machine is 150 rpm minutes, the polishing time is 1.5 minutes. In step 4 of the etching process, the etching time for one side of the 1060 aluminum plate in the etching s...

Embodiment 3

[0073] In the process steps of this embodiment, the welded joint between the 1060 aluminum plate and the MB3 magnesium alloy is cut into a sample with a side length of 20 mm and a height of 18 mm with a grinding wheel slicer or a wire cutting machine. In polishing step 3, the finely ground sample is polished with a polishing machine. During polishing, the polishing fabric is soaked with water, paved and tightened and fixed on the polishing disc of the polishing machine, and the diamond polishing liquid with a particle size of 15um is Sprinkle it on the polishing disc until the polishing fabric is wet. When polishing, you need to add an appropriate amount of diamond polishing liquid or water to maintain the humidity of the polishing disc. minutes, the polishing time is 2 minutes. In step 4 of the etching process, the etching time for one side of the 1060 aluminum plate in the etching solution is 90 seconds. The ratio of the etching solution on one side of the MB3 magnesium all...

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Abstract

This invention relates to a preparation method of 1060 aluminium plate and MB3 magnesium alloy board joint's metallographic specimen; include sampling, ground, polish, etching steps. 1Etching solution mixture ratio of 1060 aluminium plate: HNO3 2ml, HCl 2ml, HF 1ml, H2O 50m;etching solution mixture ratio of joint region: oxalic acid 1g, HNO3 1ml, acetic acid ml, H2O 150ml;Etching solution mixture ratio of MB3 magnesium alloy board: HNO3ml, oxalic acid 1to 5g, H2O 100ml. Comparing with available homogeneity stuff, this invention overcomes the problem of over etching phenomena of joint region. Prepared metallographic specimen is lucidity, is prone to analyze soldered joint's microstructure feature.

Description

technical field [0001] The invention belongs to the technical field of material welding, and in particular relates to a method for preparing a metallographic sample of a joint between a 1060 aluminum plate and an MB3 magnesium alloy plate. Background technique [0002] In recent years, lightweight and high-strength materials such as aluminum alloys and magnesium alloys have been widely used in aerospace, ships, machinery, construction, automobile manufacturing and other fields. The development of connection technology will directly affect its development. Since the conventional fusion welding method is easy to produce defects such as cracks, pores, and porosity, the friction stir connection has been developed rapidly. The friction stir welding seam has a refined forging structure, no welding defects such as pores, cracks and element burning, and the residual stress and deformation are very small. Therefore, preparing high-quality metallographic samples is an important condi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N1/32C23F1/16
Inventor 王训宏王快社
Owner 王训宏
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