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Method for preparing super fine crystal material

A technology of ultra-fine crystal and metal materials, applied in the field of preparation of ultra-fine crystal materials, can solve the problems of low deformation and high equipment tonnage, and achieve the effects of high deformation, low equipment tonnage and cost reduction

Inactive Publication Date: 2003-10-08
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method for preparing super fine crystal material
  • Method for preparing super fine crystal material
  • Method for preparing super fine crystal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Example 1: Reference figure 1 This example belongs to a method of preparing ultra-fine-grained materials by the deformation zone transfer method. It uses the friction, compression and torsion lateral transfer method to prepare a large area of ​​ultra-fine crystal material on the surface of a plate-shaped metal material and conduct surface hardening treatment. The specific process is as follows:

[0029] The rotation speed of the pressing and twisting head 11 of the equipment used should be adjustable and able to withstand a certain axial pressure; the lateral movement speed of the pressing and twisting head 11 is adjustable, and the pressing force is adjustable.

[0030] First set the rotation speed of the compression head 11 to 200~500r / min, start the machine, make the compression head 11 rotate at the set speed, adjust the distance between the compression head 11 and the material 1 to be formed, and make the compression head 11 and the material 1 Close contact.

[0031] ...

Embodiment 2

[0035] Example 2: Reference Figure 4 This example is a method of preparing rod-shaped ultra-fine crystal materials by the thermal torsion offset method, which belongs to a method of preparing rod (block)-shaped ultra-fine crystal materials by the 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 rotating clamp 3 is driven by a servo motor 4, and a torque sensor 41 is installed between the rotating 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.

[0036] The rod-shaped metal material 1 is locally heated by the intermediate frequency power supply 6 and the induction coil 7, and...

Embodiment 3

[0042] Example 3: Reference Figure 5 In this example, the rod-shaped ultra-fine crystal material is prepared by the friction, compression and torsion axial transfer method, which belongs to another method of preparing rod (bulk)-shaped ultra-fine crystal material 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 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 certain pressure. The rod-shaped metal material 1 at the contact end face produces severe shear plastic deformation, the crystal grains are broken, and the torsional deformation layer 56 is formed. At the same time, cooling water is injected into the water cooling cavity 54 of the cooling sleeve 55 through the water inlet 52, and the cooling water is...

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Abstract

A process for preparing large-area or rod-shaped ultrafine-grain crystal material by the transfer method in strong deformation region features that A pression-torsion head pressing on a planar metal material is rotating at a certain speed while transversely moving to treating the surface of the material line by line, breaking the metallic crystal grains and generating large-area ultrafine-grain crystal material.

Description

Technical field: [0001] The invention relates to a preparation method of ultrafine crystal material. Background technique: [0002] The general methods for preparing ultra-fine crystal materials include inert gas condensation, vapor precipitation, mechanical, mechanical alloying, and intense plastic deformation. The strong plastic deformation method is divided into two types, one is the high-pressure torsion plastic deformation method, and the other is the S-shaped equal-diameter lateral extrusion method. [0003] See Figure 6 In the fourth issue of "Materials Review" in 1999, Shen Hui's "Severe Plastic Deformation Method for the Preparation of Nanomaterials Ni and Ni / SiO 2 In the article, the high-pressure torsion plastic deformation method was used to perform high-pressure torsion on a wafer-shaped Ni sample with a thickness of 0.2mm and a diameter of 8mm to prepare an ultrafine-grained material with an average grain size of about 52nm. VRGertsman in "scripta metallurgica and ...

Claims

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Application Information

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