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High-uniform-elongation GPa-grade titanium and preparation method thereof

A technology of uniform elongation and titanium plate, applied in the field of mechanical properties of advanced structural materials, can solve the problem that pure titanium cannot obtain high strength and large tensile plasticity at the same time.

Active Publication Date: 2019-08-16
INST OF MECHANICS - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The invention discloses a thermomechanical processing method of metal titanium with tensile yield strength close to 1 GPa and uniform tensile elongation ≥ 10%, which is used to solve the problem that pure titanium metal cannot obtain high strength and high tensile plasticity at the same time in the prior art technical bottlenecks

Method used

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  • High-uniform-elongation GPa-grade titanium and preparation method thereof
  • High-uniform-elongation GPa-grade titanium and preparation method thereof
  • High-uniform-elongation GPa-grade titanium and preparation method thereof

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Embodiment 1

[0029] Such as figure 1 As shown, a schematic flow chart of a cyclic thermomechanical processing method according to an embodiment of the present invention is shown, which may specifically include the following steps:

[0030] Step 101, performing pretreatment on the titanium plate, the pretreatment step includes:

[0031] Step 102, pre-conditioning the titanium plate at a predetermined temperature range T 0 = 425 ~ 550 ℃ scheduled time is t 0 ≈40min solution treatment. The solution treatment is carried out in a salt bath furnace, the heating rate v 1 ≈400°C / min.

[0032] over the predetermined temperature range T 0 , annealing time t 0 and heating rate v 1 After solution treatment, the average grain size of the titanium plate in this example is about 20 μm, and the microstructure is uniform equiaxed coarse grain.

[0033] Step 103, performing mechanical grinding on the upper and lower surfaces of the solution-treated titanium plate, and processing the titanium plate t...

Embodiment 2

[0054] A GPa grade titanium with high uniform elongation is characterized in that: the volume fraction of the recrystallized lamellar structure in the titanium plate is 20-25%, and the volume fraction of the nanocrystalline matrix is ​​75-80%.

Embodiment 3

[0056] A high uniform elongation GPa grade titanium is characterized in that: the volume fraction of the recrystallized lamellar structure in the titanium plate is 20-25%, and the volume fraction of the nanocrystalline matrix is ​​75-80%; The distance between the recrystallized laminae is not more than 5 μm; the average grain size of the nanocrystalline matrix is ​​less than 200 nm; the tensile yield strength of the titanium plate is 0.8-1.2 GPa, and the uniform elongation is ≥ 10%.

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Abstract

The invention discloses a high-uniform-elongation GPa-grade titanium. The volume fraction of a re-crystallized lamellar structure in a titanium plate is 20%-25%, and the volume fraction of a nanocrystalline matrix is 75%-80%. The invention also discloses a circulating thermal mechanical processing method of the high-uniform-elongation GPa-grade titanium. Finally, a titanium sheet / strip material which is obtained with the non-uniform lamellar structure not only has a GPa-grade tensile yield strength, but also has a high-uniform tensile elongation of more than or equal to 10%. The product prepared by the method can be obtained through a conventional rolling forming technology in the industry so that large-scale production can be easily formed in the industry.

Description

technical field [0001] The invention relates to the field of mechanical properties of advanced structural materials, in particular to a GPa grade titanium with high uniform elongation and a controllable preparation method thereof. Background technique [0002] As an important lightweight structural material, pure titanium has irreplaceable application value and broad prospects in the field of biomedical engineering due to its excellent biocompatibility and corrosion resistance. Interstitial solid solution strengthening is the main strengthening method of metallic pure titanium. In industry, 100-3000ppm concentration of oxygen, nitrogen, iron and other interstitial elements are usually added to titanium to obtain high strength. For example, compared with high-purity titanium (typical yield strength about 100MPa), the grade is TA 1 –TA 4 The strength of industrially pure titanium can be increased by about 1–4 times. However, a large number of studies have shown that the bio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18C22C14/00
CPCC22C14/00C22C2200/04C22F1/183
Inventor 武晓雷杨沐鑫袁福平
Owner INST OF MECHANICS - CHINESE ACAD OF SCI
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