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A kind of gradient nano-twinned copper bulk material and its temperature control preparation method

A nano-twinned copper and bulk material technology, applied in nanotechnology, instruments, electrolytic components, etc., can solve the problem that copper materials are difficult to combine strength and toughness, and achieve high strength, high conductivity, high strength and uniform plasticity. Effect

Active Publication Date: 2020-05-05
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

[0008] In order to solve the problem that the copper material in the prior art is difficult to have both strength and toughness, the object of the present invention is to provide a gradient nano-twinned copper bulk material and its temperature-controlled preparation method. The prepared gradient nano-twinned copper Bulk materials, with the help of two effective strengthening and toughening methods of nano-twin structure strengthening and gradient structure strengthening, copper materials with high strength and good plasticity are obtained

Method used

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  • A kind of gradient nano-twinned copper bulk material and its temperature control preparation method
  • A kind of gradient nano-twinned copper bulk material and its temperature control preparation method
  • A kind of gradient nano-twinned copper bulk material and its temperature control preparation method

Examples

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Effect test

Embodiment 1

[0040] 1. Fabrication of thin-sheet gradient nano-twinned copper materials by direct current electrolytic deposition

[0041] Electrolytic deposition equipment: DC stabilized voltage and stabilized current power supply;

[0042] Requirements for the electrolyte used in electrolytic deposition: CuSO with MOS grade purity 4 Solution, strictly control the metal impurity content of the electrolyte, the water used for distributing the electrolyte should be high-purity deionized water, use analytical pure H 2 SO 4 Adjust the pH value of the electrolyte solution, and the pH value of the electrolyte solution is 1.

[0043] In the above CuSO 4 Add the following additives to the solution:

[0044]A gelatin aqueous solution with a concentration of 5wt.% prepared by analytically pure gelatin, the addition amount is 1mL / L;

[0045] The concentration of 10wt.% NaCl aqueous solution prepared by using high-purity NaCl, the addition amount is 0.6mL / L.

[0046] Cathode and anode requireme...

Embodiment 2

[0052] The difference from Example 1 is:

[0053] In the process of electrolytic deposition of gradient nano-twinned copper samples, the temperature of the electrolyte is controlled by heating with a magnetic stirrer, and the electrolyte is raised from 25°C to 40°C. During the heating process, the temperature is kept at 5°C for 2 hours; at 40°C for 4 hours After 1 hour, it is lowered to 25 °C, and it is kept at 5 °C for 2 hours during the cooling process, such as Figure 5 As shown, the electrolytic deposition time is 16h.

[0054] The prepared high-purity, high-density, flake-like gradient nano-twinned copper material has a thickness of 0.4 mm. Along the thickness direction (or with the temperature increasing first and then decreasing), the grain size and twinned layer thickness of the material all present A symmetric gradient change that first increases and then decreases, such as Figure 6 shown.

[0055] In this embodiment, the cross-sectional hardness of the gradient n...

Embodiment 3

[0058] The difference from Example 1 is:

[0059] In the process of electrolytic deposition of gradient nano-twinned copper samples, the temperature of the electrolyte is controlled by heating with a magnetic stirrer, and the electrolyte is raised from 25°C to 40°C. Reduce to 25°C after 1 hour, keep warm for 1 hour every 5°C during the cooling process, and then repeat this cooling method once, the temperature control curve is as follows Figure 8 As shown, the electrolytic deposition time is 16h.

[0060] The prepared high-purity, high-density, flake-like gradient nano-twinned copper material has a thickness of 0.4 mm. Along the thickness direction, the grain size and the thickness of the twinned wafer layer of the material show two-cycle symmetrical gradient changes. Its microstructure Figure such as Figure 9 shown.

[0061] In this embodiment, the cross-sectional hardness of the gradient nano-twinned copper material presents a two-period symmetrical gradient change with ...

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Abstract

The invention discloses a gradient nano twin crystal copper block material and a temperature control preparation method thereof, and belongs to the technical field of nano-structure metal materials. The material is prepared by adopting a direct current electrolysis deposition technology, a micro-structure is composed of micron-sized columnar crystal grains, and nano-sized twin crystal sheet layersexist in the columnar crystal grains; the size of the crystal grains, the thickness of the twin crystal sheet layers and the hardness of cross-section samples have descending or ascending continuousgradient change in the direction perpendicular to a deposition surface. The material integrates two effective strengthening and toughening structures including the nano twin crystal structure and thegradient structure, and the mechanical properties of pure copper materials are more effectively improved. The yield strength of the material can reach 463-495 MPa, the tensile strength can reach 508-532 MPa, and meanwhile the uniform elongation rate can reach 6.5-7.5%. In the preparation process of using the direct current electrolysis deposition technology, gradient nano twin crystal copper materials different in gradient type can be obtained by controlling the change type of the electrolyte temperature.

Description

technical field [0001] The invention relates to the technical field of nanostructured metal materials, in particular to a gradient nano-twinned copper block material and a temperature-controlled preparation method thereof. Background technique [0002] Copper is the earliest and most widely used non-ferrous metal. my country has used bronze to make bells, tripods and weapons since the ancient Zhou Dynasty. So far, because copper materials have excellent electrical conductivity, thermal conductivity, ductility, corrosion resistance, wear resistance and other properties, they are still widely used in electricity, electronics, energy and petrochemicals, machinery and metallurgy, transportation, light industry and other fields. [0003] However, the strength of pure copper material is low, it is difficult to meet the requirements of industrial applications. In order to improve the strength of copper materials, some other alloying elements (such as Zn, Al, Fe, Ni, Ag, Si, Sn, e...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25C1/12C25C7/06C22F3/00B82Y40/00
CPCB82Y40/00C22F3/00C25C1/12C25C7/06Y02P10/20
Inventor 卢磊程钊金帅
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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