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Method of improving mechanical property of material by changing metal material gradient nano twin-crystal structure

A technology of metal materials and nano-twins, which is applied in nanotechnology, optics, electrolytic processes, etc., can solve the problem that metal materials are difficult to have both high strength and good plasticity, and achieve high strength, increased yield strength, and high room temperature stretching The effect of intensity

Active Publication Date: 2018-10-19
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In order to solve the problem that metal materials in the prior art are difficult to have both high strength and good plasticity, the present invention provides a method for improving the mechanical properties of materials by changing the gradient nano-twin structure of metal materials. Two effective strengthening and toughening methods of structural strengthening, and the use of gradient nano-twin structure and the law of material mechanical properties, so that metal materials can obtain more excellent strengthening and toughening properties

Method used

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  • Method of improving mechanical property of material by changing metal material gradient nano twin-crystal structure
  • Method of improving mechanical property of material by changing metal material gradient nano twin-crystal structure
  • Method of improving mechanical property of material by changing metal material gradient nano twin-crystal structure

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Embodiment 1

[0044] Gradient nano-twin structure copper material, the total thickness of the sample is 400 μm. The sample is composed of micron-sized columnar grains growing along the deposition direction. The grains contain high-density twin boundaries, and most of the twin boundaries are parallel to the growth surface. The pure copper material in this embodiment has a gradient layer, and the grain size and the thickness of the twinned lamellar layer in the material show a monotonically increasing gradient along the thickness direction, with the average grain size gradually transitioning from 2.5 μm to 15.8 μm, and the average twin The wafer layer thickness gradually transitions from 29nm to 72nm, such as figure 1 shown.

[0045] In this embodiment, the microhardness of the gradient nano-twinned copper material gradually decreases along the thickness direction, from 1.5 GPa to 0.8 GPa, showing a gradient distribution, with a structural gradient of 1.75 GPa / mm, such as figure 2 shown. ...

Embodiment 2

[0048] The difference from Example 1 is:

[0049] The gradient nano-twinned copper material has 2 gradient layers. Along the thickness direction, the grain size and the thickness of the twinned lamellar layers of the material present a symmetrical gradient change that first increases and then decreases, as shown in Figure 4 shown.

[0050] In this example, the cross-sectional hardness of the gradient nano-twinned copper material first decreases and then increases along the thickness direction, and the structural gradient is 3.2 GPa / mm, as Figure 5 shown.

[0051] In this embodiment, the room temperature stretching of the gradient nano-twin structure copper material: when the stretching rate is 5×10 -3 the s -1 , the yield strength is 437±19MPa, the tensile strength is 471±18MPa, the uniform elongation is 9.2±1%, and the elongation at break is 14±1.9%, such as Figure 4 Shown in curve 2.

Embodiment 3

[0053] The difference from Example 1 is:

[0054] The gradient nano-twin structure copper material has 8 gradient layers. Along the thickness direction, the grain size and the thickness of the twinned lamellar layer of the material show a four-period gradient change that first increases and then decreases, and its microstructure is shown in Figure 6 shown.

[0055] In this embodiment, the hardness of the gradient nano-twinned structure copper material presents a four-period gradient change along the thickness direction, which first decreases and then increases, and the structural gradient is 11.6GPa / mm, such as Figure 7 shown.

[0056] In this embodiment, the room temperature stretching of the gradient nano-twinned copper material: when the stretching rate is 5×10 -3 the s -1 , the yield strength is 481±15MPa, the tensile strength is 520±12MPa, the uniform elongation is 7±0.5%, and the elongation at break is 11.7±1.3%. Such as Figure 4 Shown in curve 3.

[0057] It c...

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Abstract

The invention discloses a method of improving a mechanical property of a material by changing a metal material gradient nano twin-crystal structure, and belongs to the technical field of nano-structure metal materials. According to the method, the mechanical property of the material improved by utilizing the inherent law of the microstructure and the mechanical property of the metal material the metal material is provided with the gradient nano twin-crystal structure, and the law of the microstructure and the mechanical property of the metal material refers to regulating the mechanical property of the metal material by changing the gradient size of the nano-twin crystal structure. According to the method, two strengthening methods of nano-twin crystal strengthening and the gradient structure are integrated so that the mechanical property of the metal material can be remarkably improved; and for a gradient nano-twin crystal structure pure copper material prepared by utilizing a electrolytic deposition preparation technology, the yield strength highly reaches 481 + / - 15 MPa, the tensile strength is highly up to 520 + / - 12 MPa, meanwhile, the uniform elongation rate can reach 7 + / - 0.5%, and the elongation at break can reach 11.7 + / - 1.3%%.

Description

technical field [0001] The invention relates to the technical field of nanostructure metal materials, in particular to a method for improving the mechanical properties of materials by changing the gradient nano twin structure of metal materials. Background technique [0002] Metal materials are the earliest and most widely used materials used by humans. Since the ancient Shang and Zhou dynasties, my country has used bronze to make bells, tripods and weapons, and used iron to make agricultural tools. So far, metal materials are still widely used in the fields of transportation, machinery, power electronics, petrochemical and energy because of their good strength, toughness, electrical conductivity and easy processing, and have become the structural materials that human beings rely on for survival. [0003] Most metal materials are obtained by smelting metal ores, the grain size in the initial structure is relatively large, and the strength is generally low. In order to impro...

Claims

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Application Information

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IPC IPC(8): C25C1/12C25C7/06
CPCC25C1/12C25C7/06C25D3/38C25D5/617C25D21/12Y02P10/25B82Y40/00
Inventor 卢磊程钊金帅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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