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A kind of preparation method of nanocrystalline polycrystalline magnesium material

A nanocrystalline and magnesium technology, applied in the field of high-performance magnesium alloys or magnesium-based composite materials, can solve the problems of limited range of strength and toughness improvement, unstable material structure, and small size of the external phase, achieving simple equipment and easy industrialization. Promotion and popularization, low cost effect

Inactive Publication Date: 2011-12-28
JIANGSU UNIV
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  • Abstract
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AI Technical Summary

Problems solved by technology

[0011] Composite method 1: use an external reinforcing phase method. The optional reinforcing phases include small-sized SiC particles, carbon nanotubes, etc., because the external phase is small in size, and there are key problems that it is not easy to disperse and wet, and it also affects the strength and toughness. The range of improvement is very limited. After coating the surface of the external phase, the clusters can be overcome to a certain extent, but there is still the problem of unstable material structure; at the same time, the use of nanotubes and other enhancements increases the cost of material preparation.

Method used

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  • A kind of preparation method of nanocrystalline polycrystalline magnesium material
  • A kind of preparation method of nanocrystalline polycrystalline magnesium material
  • A kind of preparation method of nanocrystalline polycrystalline magnesium material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment one: The cryogenic and low heat cycle treatment of the "nano-matrix crystalline structure" of AZ91 deformed magnesium alloy:

[0029] The AZ91D magnesium alloy obtained by semi-continuous casting is made into a 10*10*20 block after homogenization treatment, extrusion deformation, and solution aging treatment.

[0030] One cryogenic treatment: put the sample into the cryogenic treatment box, control the cooling rate at 80°C / s, until the liquid nitrogen temperature is -196°C, the cold treatment time is 30min, take it out and put it in graphite powder to prevent oxidation during low heat treatment, Put it into a heat treatment furnace, the low thermal aging temperature is 195°C, which is 5°C lower than the conventional aging temperature of 200°C, and the aging time is 4h. After the end, the tissue test is carried out, and the results are as follows figure 1 As shown, the grain size is 40-50nm.

Embodiment 2

[0031] Embodiment two: the cryogenic and low heat cycle treatment of the "nano-matrix crystalline structure" of AZ31 cast magnesium alloy:

[0032] The smelted AZ31 cast magnesium alloy is formed by gravity casting and prepared into a 20*20*40 block.

[0033] The first cryogenic and low-heat treatment: put the sample into the cryogenic treatment box, control the cooling rate at 60°C / s, until the liquid nitrogen temperature is -196°C, and the cold treatment time is 80 minutes. After taking it out, put it in the air for 80 minutes;

[0034] The first cryogenic low-heat cycle treatment: put it into the cryogenic treatment box again, and control the cooling rate at 60°C / s until the liquid nitrogen temperature is -196°C, and the cold treatment time is 80 minutes. After taking it out, put it in the air for 80 minutes. Tissue tests were performed with results such as figure 2 As shown, the grain size is 30-40nm.

Embodiment 3

[0035] Embodiment three: Mg 2 Cryogenic and low heat cycle treatment of "nano-matrix crystal structure" of Si-strengthened AZ91 wrought magnesium matrix composites:

[0036] Adding Si during the smelting process of AZ91 to prepare Mg 2 Si particle reinforced AZ91 magnesium-based composite material, the AZ91D magnesium-based composite material obtained by semi-continuous casting is made into a 30*30*60 block after homogenization treatment, extrusion deformation, and solution aging treatment.

[0037] The first cryogenic and low heat treatment: put the sample into the cryogenic treatment box, control the cooling rate at 40°C / s until the liquid nitrogen temperature is -196°C, and the cold treatment time is 120min; take it out and put it into graphite powder (to prevent low heat treatment time oxidation) placed in a heat treatment furnace, the low heat aging temperature is 195°C, and the aging time is 4h.

[0038] The first cryogenic and low heat cycle treatment: put the s...

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Abstract

The invention relates to a high-performance magnesium alloy or magnesium-based composite material. The grain size of the prepared material matrix is in nano scale. The material has the characteristics of high strength and high toughness and belongs to the field of preparation of new materials. A cast state or deformation state magnesium alloy or magnesium-based composite material is subjected to cryogenic-low heat circulation treatment by controlling important parameters such as cryogenic temperature, cold treatment time, cold heat circulation times, low-heat temperature, heat treatment time and the like; the magnesium material after treatment has a nanocrystal microstructure and corresponds to the mechanical properties of high strength and high toughness. A preparation method of the high-performance magnesium material has the advantages of 'high performance, high efficiency, low cost and low pollution'.

Description

technical field [0001] The invention relates to a high-performance magnesium alloy or a magnesium-based composite material. The crystal grain size of the prepared material matrix is ​​at the nanometer level, and the material has high strength and toughness characteristics, and belongs to the field of new material preparation. Background technique [0002] The reserves of magnesium resources on the earth are very rich, accounting for about 2% of the mass of the earth's crust and 0.14% of the mass of seawater. At the same time, magnesium alloys and their composite materials have performance advantages such as specific stiffness, high specific strength, and good vibration resistance. 1. Strengthening and toughening is the development trend of contemporary electromechanical products. It is firstly manifested in the manufacturing of remote tools such as automobiles, aircraft and spacecraft. With the development of these industries, higher requirements are put forward for the stren...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/06
Inventor 李桂荣王宏明赵玉涛张勋寅
Owner JIANGSU UNIV
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