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Preparation method for high-density twin crystal metal material

A metal material, high-density technology, applied in the direction of electrolytic inorganic material coating, etc., can solve the problems of difficult nano-metal twinned materials, random and uncontrollable distribution, low twin grain boundary density, etc., to achieve low cost, reduce interface energy, evenly distributed effect

Inactive Publication Date: 2016-07-27
SHANXI DATONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the method of preparing nano twins mainly includes two aspects: one is the top-down method, such as plastic deformation method, local pressure deformation (Nat.Commun.2015, 6, 7648), in which the plastic deformation method, through The twinned metal materials obtained by high-pressure torsional deformation have low twin density and random and uncontrollable distribution; on the other hand, bottom-up methods, electrodeposition, magnetron sputtering (Appl.Phys.Lett., 2006, 88 , 173116), wherein the electrodeposition includes DC electrodeposition and pulse current deposition (Chinese patent CN102321896A), by adjusting the density of the current (refer to the literature: Acta Metallographica, 2013, 49, 635), the temperature of the electrolyte (referring to the literature: Acta Metallica, 2012, 48, 1342) and pulsed wave deposition rate (Science, 2009, 323, 607) to obtain nano-twinned copper nanocrystals, but currently published literature and patents, most of the obtained nano-twinned materials are twinned The boundary density is low and the grain boundary distribution is random, so it is difficult to obtain nano-metal twinned materials with high density and uniform distribution

Method used

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  • Preparation method for high-density twin crystal metal material
  • Preparation method for high-density twin crystal metal material
  • Preparation method for high-density twin crystal metal material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A preparation method of a high-density twinned silver material, comprising the steps of,

[0025] Select a silver sheet 1 with a length of 2 cm, a width of 1 cm, and a thickness of 0.5 cm, specifically as figure 1 As shown, use clean water and decontamination powder to remove surface grease and dust, and then use dilute hydrochloric acid to remove surface oxides. After polishing, use sandpaper with a particle size of 1mm on one side of the surface along the length of the silver sheet in the same direction. Grinding twice, respectively grinding out a number of parallel grooves, between any two grooves is a flat convex line, and the grooves and the convex lines are arranged at periodic intervals; the schematic diagram of the top view and side view of the silver sheet, Specific as Figure 1-2 As shown, after the first grinding, the distance G1 between each groove is 1 mm, and after the second grinding, a new groove is formed between any two adjacent grooves formed by the ...

Embodiment 2

[0029] A preparation method for a high-density twinned copper material, comprising the steps of,

[0030] Select a copper sheet with a length of 4cm, a width of 2cm, and a thickness of 0.6cm. Use clean water and decontamination powder to remove surface grease and dust, and then use dilute hydrochloric acid to remove surface oxides. After polishing, use sandpaper with a particle size of 1mm along the surface. The length of the sheet is polished twice in the same direction, and a number of parallel grooves are polished, and there are flat convex lines between any two grooves, and the grooves and convex lines are arranged at periodic intervals;

[0031] Using the two-electrode direct current electrodeposition method, the molar concentration of the electrolyte is 0.005mol / L copper sulfate solution, the cathode and the anode are all made of copper sheets with grooves after the above steps, the distance between the cathode and the anode is 4cm, the voltage is 20V, and the electrolyte...

Embodiment 3

[0033] A preparation method of a high-density twinned silver material, comprising the steps of,

[0034] Select a silver sheet with a length of 2cm, a width of 1cm, and a thickness of 0.5cm. Use clean water and decontamination powder to remove surface grease and dust, and then use dilute hydrochloric acid to remove surface oxides. After polishing, use sandpaper with a particle size of 2mm along the silver surface. The length of the sheet is polished three times in the same direction, and a number of parallel grooves are respectively polished, and there is a flat convex line between any two grooves, and the grooves and the convex lines are arranged at periodic intervals; Top and side view diagrams, specifically as Figure 1-2 shown.

[0035] Using the two-electrode DC electrodeposition method, the cathode and the anode are all selected from the silver sheet processed in the above steps, and the electrolyte is selected to have a higher molar concentration of 0.01mol / L silver ni...

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Abstract

The invention provides a preparation method for a high-density twin crystal metal material. The preparation method comprises the following steps that S1, metal sheets with the good electrical conductivity are selected, after degreasing, rust removing and polishing treatment, a plurality of parallel grooves are ground in the surface of each metal sheet through abrasive paper, a flat protrusion strip is arranged between any two grooves, and the grooves and the protrusion strips are periodically arranged at intervals; and S2, a direct current electrolytic deposition method is used, high-purity water or a metal salt solution is selected as an electrolytic solution, the metal sheets ground in the step S1 are adopted as a cathode and an anode, and electrolytic deposition is conducted to obtain the high-density twin crystal metal material. The preparation method provided by the invention is simple in process and low in cost, and the uniformly distributed high-density twin crystal metal material with the growing crystal boundary interval being 2-5 nm can be obtained.

Description

technical field [0001] The invention relates to a preparation method of a high-density twinned metal material. Background technique [0002] Grain boundary, low-energy state coherent grain boundary, is a special microstructural defect. Twin boundaries in nanomaterials have an important impact on their optical, electronic, mechanical and other properties. For example, twin boundaries in nanotwinned metals efficiently impede dislocation motion, thereby enhancing the strength, ductility, and electrical conductivity of the crystal. Both experiments (Science, 2009, 323, 607) and theory (nature, 2010, 464, 877) have confirmed that the strength of nanotwins increases with the decrease of the grain boundary spacing. Therefore, how to obtain high-density nano-twinned materials with small twin grain boundary spacing and uniform distribution has important application prospects. [0003] At present, the method of preparing nano twins mainly includes two aspects: one is the top-down m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D9/04
CPCC25D9/04
Inventor 田翠锋王萍刘红梅
Owner SHANXI DATONG UNIV