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Method for raising metal and alloy strength

A technology of alloy strength and metal, which is applied in the field of dynamic plastic deformation technology to improve the strength of metal and alloy, can solve the problems of changing the physical and chemical properties of materials, achieve the effect of simple preparation method, optimization of process parameters, and improvement of material strength

Inactive Publication Date: 2007-05-02
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Solid solution strengthening and second phase strengthening can significantly increase the strength of metal materials, but the addition of alloying elements will change the physical and chemical properties of the material

Method used

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  • Method for raising metal and alloy strength
  • Method for raising metal and alloy strength
  • Method for raising metal and alloy strength

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Using high-speed deformation technology to prepare high-strength, high-conductivity bulk high-density nano-twinned pure copper materials;

[0023] Equipment: Pneumatic high-speed deformation equipment;

[0024] Deformation strain rate: 1×10 2 the s -1 ;

[0025] Deformation strain: deformation 2.3 (5 deformations, each deformation of the first four deformations is 0.5, and the fifth deformation is 0.3);

[0026] Deformation temperature: -196°C;

[0027] Pure copper material: purity 99.95%, annealed at 700°C for 3 hours, grain size 150-200 microns.

[0028] A bulk high-density nano-sized twinned pure copper material is prepared, as shown in Figure 1. The main feature of its microstructure is bundle-shaped high-density nano-mechanical twins, with an average twin layer thickness of 30-50 nanometers and a length of 200-800 nanometers. The twin density is about 3×10 7 m 2 / m 3 . There are high-density dislocations in both the matrix and the twins, and the dislocatio...

Embodiment 2

[0030] Using high-speed deformation technology to prepare high-strength pure iron materials;

[0031] Equipment: Pneumatic high-speed deformation equipment;

[0032] Deformation strain rate: 1×10 3 the s -1 ;

[0033] Deformation strain: deformation 2 (4 deformations, each deformation 0.5);

[0034] Deformation temperature: -196°C;

[0035] Pure iron metal material: purity 99.95%, annealed at 950°C for 2 hours, grain size 100-150 microns.

[0036] The bulk pure iron material prepared by the deformation technology of the present invention uses a strain rate of 6×10 -3 the s -1 A tensile test at room temperature was carried out, and the yield strength was 680MPa (0.2% strain), and the breaking strength was 730MPa.

Embodiment 3

[0038] Using the deformation technology of the present invention to prepare high-strength nano-twinned copper-aluminum alloys;

[0039] Equipment: Pneumatic high-speed deformation equipment;

[0040] Deformation strain rate: 1×10 3 the s -1 ;

[0041] Deformation strain: deformation 2 (5 deformations, each deformation 0.4);

[0042] Deformation temperature: -196°C;

[0043] Copper-aluminum alloy: the aluminum content is 4.5wt%, annealed at 700°C for 3 hours, and the grain size is 150-200 microns.

[0044] The microstructure of the high-strength copper-aluminum alloy prepared by the deformation technology of the present invention is shown in Figure 3, and its microstructure is mainly characterized by beam-shaped high-density nanomechanical twins, with an average twin layer thickness of 15-50 nanometers and a length of 100-600 nanometers , the twin density is about 3.5×10 7 m 2 / m 3 . Using a strain rate of 6 x 10 -3 the s -1 Tensile test at room temperature was carri...

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Abstract

This invention relates to a technique that raises strength of metal and alloy, especially provides a method that in the precondition that chemical composition of metal and alloy is not changed, raising strength of metal and alloy by technique of dynamic state plastic deformation. Utilize technique of dynamic state high speed deformation, progress many manipulations with low temperature single direction, deformed strain rate is: 101-104s-1;Deformed strain variable is: total deflection exceed 1(computing method is:epsilon=ln H0 / H>1),epsilon is deflection, H0 is thickness of material without deformation, H is thickness of material with deformation; Deformation temperature is: 30deg.C to -200deg.C. This invention utilizes technique of high speed deformation, preparative method is simple, and it is easy to control parameter of deformation technology and deformation temperature. It can produce metal and alloy with high intensity through necessarily improve orthodox deformation technique, optimize technology parameter and deformation temperature. This invention does not chemical constituent of materials, only through adjust material microstructure to strengthen metal and alloy.

Description

technical field [0001] The invention relates to a technology for improving the strength of metals and alloys, and in particular provides a method for improving the strength of metals and alloys through a dynamic plastic deformation technology without changing the chemical composition of the metals and alloys. Background technique [0002] Metals and alloys can be strengthened by different methods such as solid solution strengthening, secondary phase strengthening, grain refinement and cold working. Solid solution strengthening and second phase strengthening can significantly increase the strength of metal materials, but the addition of alloying elements will change the physical and chemical properties of the material. It can also be strengthened by changing the microstructure of the material without changing the chemical composition of the metal and alloy. For bulk metal materials, the strength of the material can be improved by refining the grains. According to the Hall-P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D8/00
Inventor 陶乃镕赵伟松洪传世卢柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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