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A kind of high-strength toughness filiform grain pure titanium and its preparation method

A high-strength-toughness, filamentous technology, applied in the field of filamentary-grained pure titanium material and its preparation, can solve the problems of low strength, toughness and mechanical properties of pure titanium, and achieve the advantages of overcoming easy fracture and fragmentation, strong practicability, and preparation process. simple effect

Active Publication Date: 2019-04-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problem of low toughness and mechanical properties of pure titanium, it aims to provide a high-strength and toughness filamentary grain pure titanium from the perspective of microstructure.

Method used

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  • A kind of high-strength toughness filiform grain pure titanium and its preparation method
  • A kind of high-strength toughness filiform grain pure titanium and its preparation method
  • A kind of high-strength toughness filiform grain pure titanium and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Raw materials: pure titanium rods with a diameter of 32mm.

[0048] Follow the steps below to implement:

[0049] (1) Two-pass equal-channel angular extrusion: select a mold with a channel diameter of 32mm, and perform the first pass of equal-channel angular extrusion on the initial bar. The rotation angle of the extrusion die is 120°, and the extrusion temperature is 400°C ;Rotate the bar 180° around the axis and put it into the mold for the second pass of equal channel angular extrusion.

[0050] (2) Multi-pass swaging: the first pass swivels the 32mm diameter bar obtained in step (1) to a diameter of 24mm, and the strain is about 0.58; the second pass swages the 24mm diameter bar When the diameter reaches 16mm, the strain is about 0.81; in the third pass, the rod with a diameter of 16mm is swaged to 8mm, and the strain is about 1.39.

[0051] (3) the titanium bar of diameter 8mm obtained in step (2) is cut into cross section and is 6.9 * 4mm 2 The plate, the lengt...

Embodiment 2

[0067] The difference between this example and Example 1 is that: the partial recrystallization annealing temperature in the preparation step (10) is 400° C., and the time is 480 s.

[0068] figure 1 The thin dotted line in this case is the engineering stress-strain curve of the quasi-static tensile test along the rolling direction of the filiform grain pure titanium prepared in this case. The yield strength is as high as 838.2MPa, it has a very large work hardening rate, and the tensile strength reaches 964.8MPa , the uniform plastic strain is 6.2%, and the elongation after fracture is greater than 12%.

[0069] The microstructure is similar to that of Example 1, but the recovery degree and recrystallization ratio are reduced, and the composition ratio of filamentous grains reaches about 99%.

Embodiment 3

[0071] The difference between this example and Example 1 is that: the partial recrystallization annealing temperature in the preparation step (10) is 475° C., and the time is 300 s.

[0072] like figure 1 The thick dotted line in the figure is the engineering stress-strain curve of the quasi-static tensile test along the rolling direction of the filiform grain pure titanium prepared in this case. Compared with Example 1, the yield strength of the filamentous structure prepared in this case is reduced by about 90 MPa, while the uniform plasticity is only increased by 1.7%, and the elongation after fracture is greater than 16%. The proportion of filamentous grains in the microstructure decreased to 73%, which indicated that the filamentous grains made an important contribution to the strength and toughness of the material.

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Abstract

The invention discloses a pure titanium with high strength and toughness filamentous grains, the microstructure is composed of filamentous grains or a mixture of filamentous grains and equiaxed grains, wherein the length ratio of the long axis to the short axis of the filamentous grains is greater than 40 and the minor axis size is 10 μm ~ 10nm, and the equiaxed grains are recrystallized ultrafine grains. Also disclosed is a method for preparing pure titanium with high-strength and toughness filamentary grains, comprising the following steps: (1) adjusting the grain orientation of pure titanium with 1-2 passes of equal channel angular extrusion to obtain a titanium rod; (2 ) cutting the titanium bar obtained in step (1) after multi-pass rotary forging to obtain a titanium plate with a rectangular cross section; (3) performing annealing-multi-pass controlled rolling on the titanium plate cycle; (4) Annealed to obtain high strength and toughness filamentous grain pure titanium. The mechanical properties of the pure titanium of the present invention are equivalent to those of the alloy titanium, avoiding the expensive cost of the alloy, the complicated process and the harmful elements such as Al and V, and can be preferably used for the implantation of joints, teeth and brackets type structural material.

Description

technical field [0001] The invention belongs to the field of biological surgery implantable structural materials, and in particular relates to a pure titanium material with high strength and toughness and a preparation method thereof. Background technique [0002] Compared with Ti-xAl-yV, Ti-xAl-yNb, Ti-wSn-xNb-yTa-zPb and Ti-wZr-xNb-yTa-zPb and other common biomedical titanium alloys, pure titanium not only has better biophase Capacitance, corrosion resistance, and avoid the expensive cost of the alloy, complex process and Al, V and other elements harmful to the organism, it can be preferably used as a structural material for joints, teeth and scaffolds for biological implants. However, due to the lack of strengthening effect of alloying elements, conventional pure titanium exhibits low yield strength and wear resistance. For example, the yield strengths of TA1 (Grade 1) and TA2 (Grade 2) pure titanium specified in the standard GB / T 13810-2007 (ISO 5832-2 2012) are 170MPa ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22F1/18C22C14/00A61L27/06A61L27/50
CPCA61L27/06A61L27/50C22C14/00C22F1/183
Inventor 黄崇湘王艳飞
Owner SICHUAN UNIV
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