High strength and toughness filiform crystal grain pure titanium and preparation method thereof

A high-strength toughness, filamentary technology, applied in the field of filamentous grain pure titanium materials and its preparation, can solve the problems of low mechanical properties of pure titanium, such as strength and toughness, and achieve the goal of overcoming easy fracture and fragmentation, high efficiency and strong practicability Effect

Active Publication Date: 2018-04-06
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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  • High strength and toughness filiform crystal grain pure titanium and preparation method thereof
  • High strength and toughness filiform crystal grain pure titanium and preparation method thereof
  • High strength and toughness filiform crystal grain pure titanium and preparation method thereof

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] Such as 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 high strength and toughness filiform crystal grain pure titanium. A microstructure is constituted by filiform crystal grains or by mixing of the filiform crystal grains and equiaxed crystal grains, wherein the length ratio of the long axes to the short axes of the filiform crystal grains is larger than 40, the size of the short axes is 10 [mu]m-10 nm, and the equiaxed crystal grains are recrystallized ultra-fine grains. The invention further discloses a preparation method of the high strength and toughness filiform crystal grain pure titanium. The preparation method comprises the following steps that (1) the orientation of the crystal grains is adjusted through equal-channel corner extrusion of 1-2 passes, and thus a titanium bar is obtained; (2) the titanium barobtained in the step (1) is subjected to multiple-pass rotary forging and then cut, and thus a titanium plate with the rectangular cross section is obtained; (3) then, the titanium plate is subjectedto annealing and multiple-pass controlled rolling circularly; and (4) the high strength and toughness filiform crystal grain pure titanium is obtained after annealing. The mechanical performance of the pure titanium is equivalent to that of alloy titanium, the high cost and complex technique of an alloy and elements of Al, V and the like which are harmful to organisms are avoided, and the high strength and toughness filiform crystal grain pure titanium can be preferentially used as joint type, dental type and support type organism implantable structural materials.

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 Applications(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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