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Prepn of columnar superfine crystal material

An ultra-fine-grained and columnar technology, applied in the field of preparation of columnar ultra-fine-grained materials, can solve the problems of high tonnage of equipment and low degree of deformation, and achieve the effect of low tonnage of equipment, high degree of deformation and cost reduction.

Inactive Publication Date: 2005-07-13
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the tonnage of the equipment is high, the degree of deformation is low, and it needs to be repeated many times

Method used

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  • Prepn of columnar superfine crystal material
  • Prepn of columnar superfine crystal material
  • Prepn of columnar superfine crystal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Embodiment 1: refer to figure 1 , this example belongs to a method of preparing ultra-fine-grained materials by the deformation zone transfer method. It is to use the friction, pressure and torsion lateral transfer method to prepare a large area of ​​ultra-fine grain material on the surface of the plate metal material, and to carry out surface hardening treatment. The specific process is as follows:

[0020] The rotating speed of the used equipment for twisting head 11 should be adjustable, and can bear certain axial pressure;

[0021] First set the rotational speed of the twisting head 11 to 200-500r / min, start the machine, make the twisting head 11 rotate at the set speed, adjust the distance between the twisting head 11 and the material 1 to be formed, and make the twisting head 11 and the material 1 close contact.

[0022] The moving mechanism is started to make the pressing and twisting head 11 move relatively laterally on the material 1 at a moving speed of 20...

Embodiment 2

[0026] Embodiment 2: refer to Figure 4 , this example is the preparation of rod-shaped ultra-fine-grained material by thermal torsion migration method, which belongs to a method of preparing rod (block)-shaped ultra-fine-grained material by deformation zone transfer method. The specific process is as follows: the rod-shaped metal material 1 to be refined is stuck between the fixed fixture 10 and the rotating fixture 3 . The rotary clamp 3 is driven by a servo motor 4 , and a torque sensor 41 is installed between the rotary clamp 3 and the servo motor 4 . The induction coil 7 and the intermediate frequency power supply 6 can locally heat the rod-shaped metal material 1 . The cooling ring 45 and the cooling system 8 can locally cool the rod-shaped metal material 1 . The temperature sensor 5 is used to measure the temperature of the heating zone.

[0027] The rod-shaped metal material 1 is locally heated by the intermediate frequency power supply 6 and the induction coil 7, a...

Embodiment 3

[0033] Embodiment 3: refer to Figure 5, this example is the preparation of columnar ultra-fine-grained materials by the frictional pressure-torsion axial transfer method, which belongs to another method of preparing ultra-fine-grained materials by the deformation zone transfer method. The specific process is as follows: put the rod-shaped metal material 1 to be refined into the cooling sleeve 55, make the rod-shaped metal material 1 closely contact with the bottom of the cooling sleeve 55, and the rod-shaped metal material 1 is driven by the machine at the bottom of the cooling sleeve 55 at a high speed. Rotate and apply some pressure. The rod-shaped metal material 1 at the contact end surface undergoes severe shear plastic deformation, and the crystal grains are fragmented to form a torsional deformation layer 56 . At the same time, cooling water is injected into the water cooling chamber 54 of the cooling sleeve 55 through the water inlet 52 , and the cooling water is disc...

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Abstract

The preparation process of columnar superfine crystal material features that the rod metal material to be fined is set inside cooled sleeve, made to contact with the bottom tightly, driven to rotate at high speed and applied with certain pressure, while cooling water is introduced into the cooling sleeve, so that the rod metal material at the contact surface produces intense shearing plastic deformation and torsion deformation layer with fragmentated crystal grains. Owing the torsion deformation layer has the upper side temperature higher than lower side temperature, the torsion deformation layer is transferred from the initial friction surface to upper side high temperature area to form superfine crystal material piling layer in the lower part, and the torsion and cooling is continued until forming complete superfine crystal material. The columnar superfine crystal material is then annealed. The present invention has high deformation and low cost.

Description

Technical field: [0001] The invention relates to a preparation method of a columnar ultrafine crystal material. Background technique: [0002] The general methods for preparing ultrafine-grained materials include: inert gas condensation method, gas phase precipitation method, mechanical method, mechanical alloying method, strong plastic deformation method, etc. The strong plastic deformation method is divided into two types, one is the high-pressure torsional plastic deformation method, and the other is the S-type equal radial extrusion method. [0003] see Figure 6 , in the fourth issue of "Materials Herald" in 1999, Shen Hui's "Severe plastic deformation method to prepare nanomaterials Ni and Ni / SiO 2 "Using the high-pressure torsional plastic deformation method in the article, a disc-shaped Ni sample with a thickness of 0.2mm and a diameter of 8mm is subjected to high-pressure torsion to prepare an ultra-fine-grained material with an average grain size of about 52nm. V....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/00C22F1/057
Inventor 杜随更
Owner NORTHWESTERN POLYTECHNICAL UNIV
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