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Preparation method for sample applicable to EBSD analysis of Al and Al alloy

A technology of Al alloy and samples, which is applied in the direction of analyzing materials, using wave/particle radiation for material analysis, measuring devices, etc., can solve the problems of expensive consumables, low popularity, and high price, and achieve high equipment popularity and polishing Effects with a wide range and strong applicability

Inactive Publication Date: 2018-11-30
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Electrolytic polishing has great limitations and is more suitable for pure Al. When corroding Al alloys, it is easy to cause the peeling of the precipitated phase in the alloy, leaving deep corrosion marks; ion beam polishing requires a special instrument-ion beam Polishing instrument, currently this kind of instrument is expensive and not popular, and most of them are early models, the polishing range is very small, only a few hundred μm × hundreds of μm, making it unsuitable for coarse-grained Al and Al alloys , and the consumables required in its use are expensive, so the experimental cost is high
Vibration polishing still belongs to the scope of mechanical polishing, which can reduce the residual stress on the surface. However, because Al and Al alloys, especially Al, are very soft, it is difficult to remove small scratches on the sample surface by mechanical polishing, which affects the analysis effect of EBSD.

Method used

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  • Preparation method for sample applicable to EBSD analysis of Al and Al alloy
  • Preparation method for sample applicable to EBSD analysis of Al and Al alloy
  • Preparation method for sample applicable to EBSD analysis of Al and Al alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The flow chart of sample preparation for EBSD analysis is as follows: figure 1 shown.

[0040] Step 1. Use Mo wire as the wire cutting wire, cut a metal sheet with a diameter of 3mm and a thickness of 0.5mm from the pure Al block under the action of cooling liquid at a speed of 0.1mm / min and a current of 2-3A , as the sample to be tested for EBSD.

[0041] Step 2. Use an eraser or a rubber plug to press the metal sheet cut in step 1 and grind it on SiC sandpaper. Use 320#, 800# and 2000# sandpaper in turn to grind the metal sheet from 0.5mm to 200μm. In order to reduce the Stress is introduced during the grinding process, and the use of grinding and polishing machines is not allowed during the grinding process. The manual grinding track should be in the shape of "8".

[0042] Step 3. Configure the double spray liquid, whose composition is 25vol.% nitric acid and 75vol.% methanol; in order to reduce the speed of double spray corrosion, it is necessary to control the re...

Embodiment 2

[0046] Step 1. Use Mo wire as the wire cut wire, at a speed of 0.1mm / min, a current of 2-3A, under the action of cooling liquid, cut a diameter of 3mm and a thickness of 3mm from the hot-extruded pure Al block A metal sheet of 0.5 mm is used as the sample to be tested for EBSD.

[0047] Step 2. Use an eraser or a rubber plug to press the metal sheet cut in step 1 and grind it on SiC sandpaper. Use 320#, 800# and 2000# sandpaper in turn to grind the metal sheet from 0.5mm to 200μm. In order to reduce the Stress is introduced during the grinding process, and the use of grinding and polishing machines is not allowed during the grinding process. The manual grinding track should be in the shape of "8".

[0048] Step 3. Configure double spray liquid, its composition is 25vol.% nitric acid and 75vol.% methanol; in order to reduce the speed of double spray corrosion, it is necessary to control the reaction temperature, so use liquid nitrogen to cool down the double spray liquid, use l...

Embodiment 3

[0052] Step 1. Use Mo wire as the wire cut wire, with a speed of 0.1mm / min, a current of 2-3A, and under the action of cooling liquid, cut a diameter of 3mm from the Al-4.5wt.%Cu alloy block A metal sheet of 0.5 mm is used as the sample to be tested for EBSD.

[0053] Step 2. Use an eraser or a rubber plug to press the metal sheet cut in step 1 and grind it on SiC sandpaper. Use 320#, 800# and 2000# sandpaper in turn to grind the metal sheet from 0.5mm to 200μm. In order to reduce the Stress is introduced during the grinding process, and the use of grinding and polishing machines is not allowed during the grinding process. The manual grinding track should be in the shape of "8".

[0054] Step 3. Configure double spray liquid, its composition is 25vol.% nitric acid and 75vol.% methanol; in order to reduce the speed of double spray corrosion, it is necessary to control the reaction temperature, so use liquid nitrogen to cool down the double spray liquid, use liquid nitrogen to ...

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Abstract

The invention provides a preparation method of a sample applicable to EBSD analysis of Al and an Al alloy. According to the method, a metal sheet with a diameter of 3 mm and a thickness of 0.5 mm is cut from a metal block by using an electrospark wire-electrode cutting method and is then separately ground by using sand paper No. 320, sand paper No. 800 and sand paper No. 2000 so as to gradually thin the metal sheet to a thickness of 200 [mu]m; corroding the metal sheet by using a double-jet etching method until a shiny surface appears; and then placing the sample into an ion milling instrumentfor ion beam polishing so as to remove corrosives and corrosion marks on the surface of the sample, thereby preparing an Al or Al alloy sample for EBSD analysis. The method is convenient and simple to operate, low in preparation cost and large in a polishing range, can be implemented by using preparation equipment for transmissions without purchasing of extra instruments, has good versatility, and is applicable to preparation of EBSD samples from all kinds of Al and Al alloys and other metal materials.

Description

technical field [0001] The invention relates to a method for preparing a sample for Al and Al alloy EBSD analysis, which belongs to the field of metal material microstructure analysis, and specifically relates to a method for preparing a sample for EBSD by using electric spark wire cutting, mechanical grinding, double jet corrosion and ion thinning. Process for analyzing Al and Al alloy samples. Background technique [0002] Al and Al alloys have low density and good corrosion resistance, and are widely used in human daily life, especially in aerospace and automotive fields. With the development of science and technology, people put forward higher performance requirements for Al and Al alloys, and the research and development of advanced Al and Al alloys has become a hot spot in the field of materials. Electron Backscatter Diffraction (EBSD) is an advanced material characterization method. It can perform fast EBSD scanning on the surface of the sample through the automatic ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/20008
CPCG01N23/2005
Inventor 梁加淼曹磊张震王俊
Owner SHANGHAI JIAO TONG UNIV
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