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Cold treatment method for preparing high-toughness metal-base composite material

A composite material and cold treatment technology, which is applied in the application field of pulsed magnetic fields when cryogenically treating metal matrix composite materials, can solve problems that do not involve material processing methods, etc.

Inactive Publication Date: 2010-09-08
JIANGSU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Aiming at the research method of combining cryogenic and magnetic field treatment, the literature search shows that the invention patents related to this technology include: Chinese utility model patent 92243315 provides a cryogenic treatment box, which can only process materials with liquid nitrogen; Chinese utility model patent CN2520936Y proposes a device for cryogenic and high-temperature superconducting magnetic field processing materials, mainly to provide a device that can simultaneously perform cryogenic and magnetic field processing, and does not involve material processing methods, such as cryogenic treatment systems, magnetic field parameter settings and material types relationship between

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment one: high toughness (Al 3 Zr (s) +Al 2 o 3(s) )p / 7055 Aluminum Matrix Composite

[0023] Melting 7055 aluminum alloy (Zn: 8.4~8.6, Cu: 2.0~2.2, Mg: 2.2~2.4, Zr: 0.05~0.25, all in mass percentage, the total amount of alloy is between 12.5~13.5), and then use zirconium carbonate as Raw materials, through the melt direct reaction method, that is, the baked zirconium carbonate powder is added to the high-temperature aluminum alloy melt, and the in-situ reaction generates Al 2 o 3 , Al 3 For the Zr particles, the total particle fraction is controlled at 4-5 vol.%, and the particle size is at the micronano level. Cast ingots with a diameter of 100 mm through semi-continuous casting in a copper crystallizer. After the ingot is homogenized at 450°C for 12 hours, it is hot-extruded. The extrusion ratio is 16:1, and the extrusion rod diameter is 25 mm. Solution treatment at 475°C for 6 hours and aging treatment at 120°C for 24 hours were performed, followed by...

Embodiment 2

[0024] The preparation of implementation example 2 high strength and toughness SiCp / AZ91 magnesium-based composite material

[0025] Melt AZ91 magnesium alloy (9.0% Al, 0.95% Zn, 0.2% Mn, the balance is Mg.), put the AZ91 magnesium alloy ingot into a crucible furnace at 720 ° C for heating, and feed N 2 and SF 6 Mixed gas for protection. After the AZ91 magnesium alloy ingot is completely melted, keep it warm for about 10 minutes, then put the micro-nano SiC particles into the crucible, and carry out electromagnetic stirring and manual stirring, and the stirring time is about 5 minutes. The stirred melt needs to stand for 2 to 3 minutes to separate the oxides generated during the stirring process from the melt. When the temperature of the furnace rises to 720°C, it is ready for casting. The hot extrusion process is: extrusion temperature 230°C, extrusion ratio 35. Afterwards, solution treatment at 413°C for 20h was carried out, followed by water cooling, and the aging treat...

Embodiment 3

[0026] Implementation example 3 preparation of high strength and toughness TiCp / Ti titanium-based composite material

[0027]Micronano TiC particles reinforced titanium matrix composites were prepared by melting and casting. Start from room temperature, cool down to the melting point of liquid nitrogen (-196°C) at a cooling rate of 45°C / min, keep warm for 35h, apply a pulsed magnetic field at the end of the treatment, the magnetic induction intensity is 20T, the magnetic field frequency is 2Hz, and the processing time is 50s, then place the sample in the air , gradually increased to room temperature. Perform performance testing. Strength 1132MPa, impact toughness 40.8J.cm -2 .

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Abstract

The invention relates to a cold treatment method for preparing high-toughness metal-base composite material, belonging to the technical field of material preparation. The method is that a pulsed magnet field is applied in the process of the deep cold treatment of the metal-base composite material to enable the material to have high toughness. By using the transient impact effect of the pulsed magnetic field, high-density dislocation structures in the material are enabled to move rapidly to induce the generation of nano twin crystals. After treatment, the composite material has organization characteristics of nanoscale coherent interfaces. The duration of the deep cold treatment is 1h-40h. The short-time pulsed magnetic field is applied at the later stage of the cold treatment, wherein the parameters the magnetic field: the magnetic induction intensity is 5-40T, the magnetic field frequency is 0.1-5Hz and the magnetic field treatment duration is 10-100s. The invention has the advantages that the solidification structure of the metal-base composite material prepared through the method is compact, the residual stress is small, the high-density nano twin crystals exist and the toughness of the composite material is synchronously and greatly improved.

Description

technical field [0001] The invention relates to the technical field of preparation of high-strength and tough metal-matrix composite materials, in particular to a method for applying a pulsed magnetic field when cryogenically treating metal-matrix composite materials. Background technique [0002] The preparation of high-strength and tough metal materials is the pursuit goal of materials scholars, but from the perspective of strengthening mechanism, there is a contradiction between the strength and toughness of materials. With the adjustment of the national industrial structure and the development of the national economy, aviation, aerospace, high-tech, military and other industries have made great progress, and there is an urgent demand for lightweight, high-strength and tough metal materials. Therefore, it is urgent to study a new material preparation and processing method, so that the metal material has high toughness while obtaining high strength. [0003] From the pers...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/00
Inventor 李桂荣王宏明孙大卫赵玉涛
Owner JIANGSU UNIV
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