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Observation method of Ti-Ni alloy metallographic structure

A technology of metallographic structure and titanium-nickel alloy, which is applied in the direction of measuring devices, preparation of test samples, material analysis through optical means, etc., can solve the problems of pseudo-structure, difficult to polish, and inability to obtain titanium-nickel alloy metallographic structure, etc. , to achieve the effect of avoiding pseudo-organization and easy operation

Active Publication Date: 2011-05-04
西安汉唐分析检测有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the existing titanium-nickel alloy literature, it is difficult to obtain a clear microstructure due to the preparation method and corrosion problems
For example, it is not easy to polish during metallographic sample preparation, and it is not easy to show microstructure during chemical erosion, and it is very easy to cause pseudo-structure
These problems make it impossible for us to obtain the ideal metallographic structure of titanium-nickel alloy

Method used

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  • Observation method of Ti-Ni alloy metallographic structure
  • Observation method of Ti-Ni alloy metallographic structure
  • Observation method of Ti-Ni alloy metallographic structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Machining the titanium-nickel alloy sample into a metallographic observation plane;

[0020] (2) Put the machined metallographic observation plane on the grinding machine with a particle size of 150 # , 700 # , 1000 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the grain size sandpaper is changed to ensure that the last grinding trace is completely eliminated, and the sand grains on the metallographic observation plane are washed away after grinding;

[0021] (3) Place the metallographic observation plane, which has been ground and rinsed off the sand grains, on the polishing machine, and use Cr 2 o 3 The solution is used as a polishing agent for mechanical polishing;

[0022] (4) adopting mass concentration to be 95% H 2 SO 4 , with a mass concentration of 65% HNO 3 , mass concentration is 45% HF and water preparation corrosion solution, with corrosion solution etching step (3) in the metall...

Embodiment 2

[0026] (1) Machining the titanium-nickel alloy sample into a metallographic observation plane;

[0027] (2) Put the machined metallographic observation plane on the grinding machine with a particle size of 150 # , 700 # , 1000 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the grain size sandpaper is changed to ensure that the last grinding trace is completely eliminated, and the sand grains on the metallographic observation plane are washed away after grinding;

[0028] (3) place the metallographic observation plane that rinses off the grit after grinding on the polishing machine, and use diamond powder with a particle size of 2.5 μm as a polishing agent to perform mechanical polishing;

[0029] (4) adopting mass concentration to be 98% H 2 SO 4 , with a mass concentration of 66.5% HNO 3 , mass concentration is 50% HF and water preparation corrosion solution, with corrosion solution corrosion step (3) in ...

Embodiment 3

[0033] (1) Machining the titanium-nickel alloy sample into a metallographic observation plane;

[0034] (2) Put the machined metallographic observation plane on the grinding machine with a particle size of 150 # , 700 # , 1000 # The metallographic water sandpaper is ground step by step, and the grinding direction is rotated 90° every time the grain size sandpaper is changed to ensure that the last grinding trace is completely eliminated, and the sand grains on the metallographic observation plane are washed away after grinding;

[0035] (3) Place the metallographic observation plane, which has been ground and rinsed off the sand grains, on the polishing machine, and use Cr 2 o 3 The solution is used as a polishing agent for mechanical polishing;

[0036] (4) adopting mass concentration to be 96.5% H 2 SO 4 , with a mass concentration of 65% HNO 3 , a mass concentration of 40% HF and water to prepare an etching solution, etch the mechanically polished metallographic obse...

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Abstract

The invention discloses an observation method of a Ti-Ni alloy metallographic structure, comprising the following five steps: 1. machining a metallographic observation plane; 2. grinding; 3. mechanically polishing; 4. etching; and 5. observing. The surface of a mechanically-polished sample is etched by an etchant solution, avoids forming an oxidation film as the paraboloid is oxidized, and avoids generating a pseudo structure because of etching. The observation method in the invention is easy to operate, in non-hazardous, can clearly show the Ti-Ni alloy metallographic structure and does not need any special equipment.

Description

technical field [0001] The invention belongs to the technical field of material surface structure observation, and in particular relates to a method for observing the metallographic structure of a titanium-nickel alloy. Background technique [0002] Titanium-nickel alloy is a shape memory alloy widely used at present. Its stretch rate is above 20%, its fatigue life is 107 times, its damping characteristics are 10 times higher than ordinary springs, and its corrosion resistance is better than the best medical stainless steel at present, so it can meet the application requirements of various engineering and medicine. It is a very excellent functional material. In order to study the properties of titanium-nickel alloys, it is necessary to observe the microstructure and grain size of titanium-nickel alloys to determine whether the grains are uniform, so as to improve various processes. In the existing Ti-Ni alloy literature, it is difficult to obtain a clear microstructure due...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/84G01N1/32
Inventor 武晶晶何伟杨军红马红征石科学惠晓原
Owner 西安汉唐分析检测有限公司
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