Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A method to improve the mechanical properties of materials by changing the gradient nano-twin structure of metallic materials

A metal material, nano-twin technology, applied in nanotechnology, optics, electrolysis process, 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 increased work hardening rate. Effect

Active Publication Date: 2021-01-12
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
View PDF2 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A method to improve the mechanical properties of materials by changing the gradient nano-twin structure of metallic materials
  • A method to improve the mechanical properties of materials by changing the gradient nano-twin structure of metallic materials
  • A method to improve the mechanical properties of materials by changing the gradient nano-twin structure of metallic materials

Examples

Experimental program
Comparison scheme
Effect test

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. Along the thickness direction, the grain size and the thickness of the twinned lamellar layer in the material show a monotonously increasing gradient change, and the average grain size gradually transitions from 2.5 μm to 15.8 μm. 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 1.5GPa to 0.8GPa, showing a gradient distribution, with a structural gradient of 1.75GPa / mm, such as figure 2 shown.

[0046] In this embodim...

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 show a symmetrical gradient change that first increases and then decreases, as shown in Figure 4 shown.

[0050] In this embodiment, 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 3.2GPa / mm, such 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 Image 6 shown.

[0055] In this embodiment, the hardness of the copper material with gradient nano-twinned structure shows a four-period gradient change along the thickness direction, which first decreases and then increases, and the structural gradient is 11.6GPa / mm, 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 can b...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
sizeaaaaaaaaaa
thicknessaaaaaaaaaa
yield strengthaaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for improving the mechanical properties of materials by changing the gradient nano-twin crystal structure of metal materials, and belongs to the technical field of nano-structure metal materials. The method is to improve the mechanical properties of the material by utilizing the inherent laws of the microstructure and mechanical properties of the metal material; the metal material has a gradient nano-twin structure, and the law of the micro-structure and mechanical properties of the metal material refers to changing the nano-twin structure by changing the nano-twin structure. The size of the gradient regulates the mechanical properties of metal materials. This method combines two strengthening methods of nanotwin strengthening and gradient structure, which can significantly improve the mechanical properties of metal materials. The graded nano-twin structure pure copper material prepared by electrolytic deposition technology: the yield strength is as high as 481±15MPa, the tensile strength is as high as 520±12MPa, the uniform elongation can reach 7±0.5%, and the fracture elongation can reach 11.7±11.7± 1.3%%.

Description

technical field [0001] The invention relates to the technical field of nano-structure 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 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 improve t...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
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
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com