Preparation method for ultra-fine grain pure titanium through equal channel angular pressing

A technology of ultra-fine-grained pure titanium and equal-diameter channels, which is applied in the field of plastic processing of materials, can solve problems such as excessive extrusion force, achieve the effects of reducing extrusion force, improving comprehensive mechanical properties, and improving operability

Active Publication Date: 2014-08-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to overcome the shortcomings of excessive extrusion force in the prior art, the present invention proposes a method for preparing ultra-fine-grained pure titanium by equal-diameter channel extrusion

Method used

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  • Preparation method for ultra-fine grain pure titanium through equal channel angular pressing
  • Preparation method for ultra-fine grain pure titanium through equal channel angular pressing
  • Preparation method for ultra-fine grain pure titanium through equal channel angular pressing

Examples

Experimental program
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Effect test

Embodiment 1

[0043] The mold used in this embodiment adopts the prior art, including two half molds, extrusion rods and some bolts, such as figure 2 shown in a and 2b. Before extrusion, evenly apply a layer of compound lubricant inside the channel, and put the extrusion rod into the channel, so that the extrusion rod can play a role in positioning and prevent the dislocation of the two halves during installation; Two symmetrical mold halves are assembled to form a complete mold with a channel inner angle of 120° and an outer corner of 20°. The extrusion route selects the Bc route with the best refinement effect, that is, after each pass of extrusion, the extrusion sample is rotated 90° clockwise and then put into the entrance channel again; adjust the downward movement speed of the beam of the universal testing machine, Make the extrusion rod move down along the channel at a speed of 0.5-1.5mm / s. In this embodiment, the downward movement speed of the extrusion rod is 0.5 mm / s.

[0044] ...

Embodiment 2

[0062] The mold selected in this embodiment is a mold composed of two halves with a channel angle of 120° and an outer fillet of 20°. The extrusion route selects the Bc route with the best refinement effect, that is, after each pass of extrusion is completed, the The extrusion sample is rotated 90° clockwise and put into the entrance channel again; the extrusion rod moves down the channel at a speed of 0.5mm / s, which can be controlled by adjusting the speed of the beam of the universal testing machine. This embodiment is operated at normal temperature.

[0063] The concrete process of this embodiment is:

[0064] Step 1, preparation of copper-titanium sample:

[0065] Cut the industrial pure titanium TA2 hot-rolled plate into a cylinder with a length of 70 mm and a diameter of 8 mm to make a titanium rod. One end of the titanium rod is a cone.

[0066] Cut the pure copper into a cylinder with a length of 80 mm and a diameter of 10 mm to make a copper rod. A tapered blind h...

Embodiment 3

[0082] The selected mold used in this embodiment is a mold composed of two halves with a channel angle of 90° and an outer fillet angle of 30°. Die channel angle and outer fillet are important parameters that affect the amount of deformation of the extrusion sample after each pass of extrusion. Reducing the channel angle can effectively increase the plastic deformation of each pass of the extrusion sample and increase the Rounded corners can make it easier for the specimen to pass through the corners. The extrusion route selects the Bc route with the best refinement effect, that is, after each pass of extrusion, the extrusion sample is rotated 90° clockwise and then put into the entrance channel again; the extrusion rod moves down the channel at a speed of 1.5mm / s, it can be controlled by adjusting the downward movement speed of the beam of the universal testing machine. This embodiment is operated at normal temperature.

[0083] The concrete process of this embodiment is: ...

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Abstract

The invention provides a preparation method for ultra-fine grain pure titanium through equal channel angular pressing. According to the invention, test conditions are improved on the basis of the prior art, a to-be-extruded sample is designed to be a copper-wrapped titanium rod, so frictional force generated during contact between the sample and a channel is reduced during extruding; extruding force is decreased to no more than 150 KN, so experimental operability is improved, and refining of industrial pure titanium can be finished at room temperature under small extruding force through equal channel angular pressing. At room temperature, the phenomena of restoring and recrystallization softening of crystal grains during refining hardly occur, so a substantial crystal grain refining effect is obtained and a high-strength industrial pure titanium block can be obtained through few times of extruding. According to results of testing of mechanical properties of the prepared ultra-fine grain pure titanium, the ultra-fine grain pure titanium has substantially improved comprehensive mechanical properties, block ultra-fine grain pure titanium can be used in practice, and the application scope of the ultra-fine grain pure titanium is broadened.

Description

technical field [0001] The invention relates to the technical field of plastic processing of materials, in particular to a method for preparing ultra-fine-grained pure titanium at room temperature by using an equal-diameter channel extrusion technology. Background technique [0002] Due to its high specific strength and specific stiffness, good corrosion resistance, and excellent biochemical and biomechanical compatibility, titanium has been widely used in the fields of aerospace, automobile, biology and medicine. However, its application is limited due to its low strength and poor wear resistance, and grain refinement is an effective way to improve the mechanical properties of pure titanium and expand its application range. [0003] The severe plastic deformation (Severe Plastic Deformation, referred to as SPD) technology is currently recognized by the international material science community as the most promising method for preparing bulk nano- and ultra-fine-grained mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/18
Inventor 李建国郭亚洲赵峰李玉龙孙翔宇
Owner NORTHWESTERN POLYTECHNICAL UNIV
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