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Speckle preparation method of prefabricated deformed pure titanium and detwinning characterization method of pure titanium

A prefabricated deformation, pure titanium technology, applied in surface reactive electrolytic coating, instrumentation, material analysis using wave/particle radiation, etc., can solve problems such as low EBSD pattern calibration rate

Active Publication Date: 2021-09-14
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The main purpose of the present invention is to provide a speckle preparation method of prefabricated deformed pure titanium and a detwinning characterization method of pure titanium, so as to solve the problem of low EBSD pattern calibration rate of detwinning deformation of pure titanium in the prior art

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  • Speckle preparation method of prefabricated deformed pure titanium and detwinning characterization method of pure titanium
  • Speckle preparation method of prefabricated deformed pure titanium and detwinning characterization method of pure titanium
  • Speckle preparation method of prefabricated deformed pure titanium and detwinning characterization method of pure titanium

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preparation example Construction

[0046] The speckle preparation method of prefabricated deformed pure titanium of the present invention comprises the following steps:

[0047] (1) Preparation of prefabricated deformed pure titanium with twins;

[0048] The prefabricated deformed pure titanium is obtained by compressively loading the original sample of pure titanium; the engineering strain of the original sample of pure titanium is 0.08-0.1, and the compressive strain rate is 10 -3 the s -1 . The grain size of the original sample pure titanium is 40-60 μm.

[0049] (2) Prepare characteristic speckles on the surface of the prefabricated deformed pure titanium, and then perform EBSD characterization;

[0050] Using an electrolytic cell, prefabricated deformed pure titanium is used as the anode, and the cathode is made of copper, titanium, stainless steel or Ni-Ti alloy, which is composed of perchloric acid and methanol. The volume ratio of perchloric acid to methanol is 1: (8~10), and the voltage The voltage...

Embodiment 1

[0052] The voltage of embodiment 1 is 12V, the voltage of embodiment 2 is 14V, the voltage of embodiment 3 is 15V, the voltage of embodiment 4 is 16V, the voltage of embodiment 5 is 18V, and the voltage of embodiment 6 is 19V. Other parameters of Examples 1 to 6 are as follows: the engineering strain of the original sample pure titanium is 0.09, the grain size of the original sample pure titanium is 50 μm, the cathode is copper, and the volume ratio of perchloric acid to methanol is 1 :9, the current is 0.95~1.05A, the electrolysis time is 3min, and the electrolyte temperature is -32°.

[0053] The characterization results of Examples 1-6 are as follows:

[0054] The SEM photo of the prefabricated deformed pure titanium after the electrolysis of embodiment 1 is as follows figure 1 shown, from figure 1 It can be seen that the surface of the prefabricated deformed pure titanium after electrolysis is very smooth, and the image gray values ​​in different regions are almost the s...

Embodiment 7

[0055] The current of Example 7 is 0.75-0.85A, the current of Example 8 is 0.85-0.95A, and the current of Example 9 is 1.05-1.15A. Other parameters of Examples 7 to 9 are as follows: the engineering strain of the original sample pure titanium is 0.09, the grain size of the original sample pure titanium is 50 μm, the cathode is copper, and the volume ratio of perchloric acid to methanol is 1 :9, the voltage is 16V, the electrolysis time is 3min, and the electrolyte temperature is -32°.

[0056] The characterization result of embodiment 7~9 is as follows:

[0057] Figure 7-9 These are the SEM photos of the prefabricated deformed pure titanium in Examples 7-9, respectively. from Figure 7 It can be seen that the surface of the prefabricated deformed pure titanium after electrolysis is smooth and has no characteristic speckles. Compared image 3 , Figure 7-9 It can be seen that with the increase of current, the surface of the prefabricated deformed pure titanium after elec...

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Abstract

The invention discloses a speckle preparation method of prefabricated deformed pure titanium and a detwinning characterization method of pure titanium. The detwinning characterization method of pure titanium comprises the following steps: (1) preparing prefabricated deformed pure titanium with twins; (2) preparing characteristic speckles on the surface of the prefabricated deformed pure titanium, and then performing EBSD characterization; (3) ) to prepare detwinned deformed pure titanium; (4) EBSD characterization of detwinned pure titanium; wherein, in step (2), an electrolytic cell is used, and prefabricated deformed pure titanium is used as an anode, and the electrolyte includes perchloric acid and methanol, and the voltage The voltage is 15~19V, the current is 0.85~1.15A, the electrolysis time is 2~4min, and the electrolyte temperature is -31°~-35°. The present invention prepares characteristic speckles through the phenomenon of electrochemical dissolution, does not use other speckle materials different from pure titanium, and reduces the influence of speckle materials on EBSD characterization. Secondly, the characteristic speckle can satisfy both EBSD characterization and DIC analysis before and after de-twinning, which is conducive to deeper research on twinning mechanism and de-twinning mechanism.

Description

technical field [0001] The invention relates to the technical field of twin crystal characterization, in particular to a speckle preparation method of prefabricated deformed pure titanium and a detwinning characterization method of pure titanium. Background technique [0002] Industrial pure titanium is widely used in aerospace, shipbuilding, petrochemical and biomedical fields due to its low density, high strength, good corrosion resistance and biocompatibility, and occupies an important position in the fields of national defense and national economy. . Pure titanium has a close-packed hexagonal structure at room temperature, and the low-symmetry crystal structure makes the number of independent slip coefficients less at room temperature, {0002}(11-20) basal slip and {10-10}(11-20 ) cylindrical slip can contribute two independent slip systems to the plastic deformation of pure titanium. There is an independent slip system, so twins are needed to realize the plastic deform...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N23/203G01N23/207G01N23/20008C25D11/26
Inventor 关新兴卢磊罗胜年
Owner SOUTHWEST JIAOTONG UNIV
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