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

A prefabricated deformation, pure titanium technology, applied in surface reaction electrolytic coating, electrolytic coating, coating and other directions, can solve the problem of low calibration rate of EBSD pattern, and achieve the effect of reducing influence and simple process

Active Publication Date: 2019-05-03
SOUTHWEST JIAOTONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

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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 for prefabricated deformed pure titanium and a pure titanium detwinning characterization method. The pure titanium detwinning characterization method comprises steps that (1), prefabricated deformed pure titanium having twin crystal is prepared; (2), characteristic speckles are prepared on the surface of the prefabricated deformed pure titanium,and then EBSD characterization is performed; (3), the detwinning deformed pure titanium is prepared; and (4), EBSD characterization of the detwinning pure titanium is performed; wherein, in the (2),an electrolytic cell is used, the prefabricated deformed pure titanium is used as an anode, the electrolyte includes perchloric acid and methanol, the voltage is 15-19V, the current is 0.85-1.15A, theelectrolysis time is 2-4 minutes, and the electrolyte temperature is -31-35 DEG C. The method is advantaged in that the characteristic speckles are prepared by an electrochemical dissolution phenomenon, other speckle materials different from the pure titanium are not used, the effect of the speckle material on EBSD characterization is reduced, secondly, the characteristic speckles can satisfy both EBSD characterization and DIC analysis before and after detwinning, and the method is conducive to the deeper study of the twinning mechanism and the detwinning 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 Applications(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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