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Preparation method of gradient metal material with high elongation

A technology of high elongation and metal materials, applied in the field of preparation of gradient metal materials, can solve problems such as poor elongation of gradient metal materials, and achieve the effect of easy implementation and simple process

Active Publication Date: 2022-04-19
SOUTHWEST JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The main purpose of the present invention is to provide a method for preparing a gradient metal material with high elongation, so as to solve the technical problem of poor elongation of the gradient metal material in the prior art

Method used

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  • Preparation method of gradient metal material with high elongation
  • Preparation method of gradient metal material with high elongation
  • Preparation method of gradient metal material with high elongation

Examples

Experimental program
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Effect test

preparation example Construction

[0041] The specific embodiment of the preparation method of the gradient metal material with high elongation of the present invention comprises the following steps:

[0042] (1) Obtain a metal body.

[0043] figure 1 It is a structural schematic diagram of an embodiment of a metal body.

[0044] like figure 1 As shown, the metal blank has a test section 100, a clamping section 200 positioned at both ends of the test section 100 and an arc section 300 between the test section 100 and the clamping section 200; the cross section of the test section 100 is Circular, the length of the test section 100≤5 times the diameter of the test section 100, the diameter of the test section 100 is 0.5-20mm; the angle between the clamping section 200 and the torsion device is adapted; the arc section The length of 300 is 5-15 mm. By setting the arc section 300, the shear stress concentration caused by the sudden change in diameter of the clamping section 200 and the testing section 100 can ...

Embodiment 1

[0065] The difference in the preparation method of the twisted green body in Examples 1-5 is only the difference in the number of twisted circles, and the rest of the parameters are the same; the number of twisted circles in Example 1 is 0 circles, and the number of twisted circles in Example 2 is 1 circle. The number of torsional turns of example 3 is 2 turns, the number of torsional turns of embodiment 4 is 4 turns, and the number of torsional turns of embodiment 5 is 8 turns; all the other parameters are specifically: the material of the metal body is aluminum alloy, the test section 100 The length L is 24mm, the diameter is 4mm, the length L1 of the clamping section 200 is 7mm, and the length L2 of the arc section 300 is 11mm; the heat treatment is heat treatment at 180°C for 1 hour, and natural cooling; the twist rate is 1° / second; One end is fixed and the other end is twisted. One turn means that the twisted clamping section 200 rotates 360°; the direction of rotation is ...

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Abstract

The invention discloses a preparation method of a gradient metal material with high elongation. The technical problem that in the prior art, the elongation of the gradient metal material is poor is solved. The invention discloses a preparation method of a gradient metal material with high elongation. The preparation method comprises the following steps: (1) obtaining a metal blank; (2) twisting the metal blank to obtain a twisted blank; and (3) the twisted blank is subjected to annealing treatment, and the gradient metal material with the high elongation rate is obtained.

Description

technical field [0001] The invention relates to the technical field of a gradient metal material with a gradient nanostructure whose grain size increases sequentially from outside to inside, in particular to a preparation method of a gradient metal material with high elongation. Background technique [0002] Gradient nanostructures usually consist of a nanostructured surface layer and a central coarse-grained layer with gradient grains distributed in the middle. Therefore, gradient nanostructures are a typical cross-scale particle hierarchy with a superior combination of strength and ductility. Gradient microstructures can form completely different grain sizes, different twin spacings, or a combination of micro-nano grains and twins. Therefore, gradient nanostructures have the potential to avoid the trade-off dilemma between strength and ductility in materials science. [0003] The preparation methods of gradient metal materials with gradient nanostructures are generally div...

Claims

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Application Information

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IPC IPC(8): C22F1/04C22F1/18C22F1/10C22F1/08C21D1/30C21D7/02
CPCC22F1/04C22F1/183C22F1/08C21D1/30C21D7/02C22F1/10
Inventor 魏文强罗胜年马新凯钟东灵
Owner SOUTHWEST JIAOTONG UNIV