A kind of high-strength and high-toughness magnesium alloy plate and preparation method thereof

A high-strength, high-toughness, magnesium alloy technology, applied in the field of high-strength, high-toughness magnesium alloy sheet and its preparation, can solve the problems of incompatibility between high strength and high toughness, balance restricting wide application, unfavorable material forming and processing, etc., to achieve improved Competitiveness, improvement of structure and performance stability, and improvement of plasticity

Active Publication Date: 2019-01-29
郑州轻研合金科技有限公司
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there is no material in the field of materials like magnesium, where potential and reality are so reversed, for example: about 70% of the produced magnesium is used for functional applications (steel desulfurization, alloying element addition, metal reduction, magnesium for fireworks powder, sacrificial anode), about 13% are used for casting alloys, only about 3% are used for more promising deformed products, and the world output is less than 50,000 tons, especially magnesium alloy plates and strips that represent the maturity of the industry, in 2015 The annual output in China is less than 400 tons, and the global output is expected to be less than 1,000 tons
[0005] The results of literature research show that, on the one hand, the existing grades of magnesium-lithium alloys, such as MA18, MA21, LA141, etc., either have very low strength or poor plasticity, and the balance of strength and plasticity limits their wide application; on the other hand , some invention patents have proposed magnesium-lithium alloy materials with low lithium content, such as CN201310177285.1 (a high-strength magnesium-lithium alloy and its preparation method), CN200710144339.9 (a high-strength magnesium-lithium alloy), these The alloy material has high strength, but contains a large amount of rare earth elements, which not only increases the cost of the material, but also is not conducive to the forming and processing of the material
[0006] So far, magnesium alloy materials have the problem that high strength and high toughness cannot be balanced, and the cost is high. There is no low-cost, high-strength and high-toughness magnesium alloy. A high-strength, high-toughness magnesium alloy is obtained through alloying. The application of magnesium alloy has very important practical significance

Method used

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  • A kind of high-strength and high-toughness magnesium alloy plate and preparation method thereof
  • A kind of high-strength and high-toughness magnesium alloy plate and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A high-strength and high-toughness magnesium alloy plate is made of the following components in weight percentage: Li: 10.5%, Al: 2%, Ag: 0.5%, Sn: 0.8%, Ca: 0.5%, Sr: 0.5%, The balance is Mg.

[0027] The preparation method of the above-mentioned high-strength and high-toughness magnesium alloy plate comprises the following steps:

[0028] (1) Mixing is carried out according to the mass percentage of each component in the alloy, and the raw materials are melted under an argon atmosphere at 750°C to obtain molten metal;

[0029] (2) Casting the molten metal obtained in step (1) to obtain an ingot; then keeping the ingot at 350°C under an argon atmosphere for 10 hours to obtain a homogenized ingot;

[0030] (3) Remove the surface scale (peeling and polishing) from the homogenized ingot obtained in step (2), and then roll it once to obtain a slab;

[0031] (4) Heat the slab obtained in step (3) at 385°C for 8 minutes, then quench it, and then age it at 70°C for 4 hours;...

Embodiment 2

[0034] A high-strength and high-toughness magnesium alloy plate is made of the following components by weight percentage: Li: 8%, Al: 5%, Ag: 1.5%, Sn: 0.8%, Ca: 2%, Sr: 1.2%, The balance is Mg.

[0035] The preparation method of the above-mentioned high-strength and high-toughness magnesium alloy plate comprises the following steps:

[0036] (1) Mixing is carried out according to the mass percentage of each component in the alloy, and the raw materials are melted under an argon atmosphere at 680°C to obtain molten metal;

[0037](2) Casting the molten metal obtained in step (1) to obtain an ingot; then keeping the ingot at 340°C under an argon atmosphere for 12 hours to obtain a homogenized ingot;

[0038] (3) Remove the surface scale (peeling and polishing) from the homogenized ingot obtained in step (2), and then roll it once to obtain a slab;

[0039] (4) Heat the slab obtained in step (3) at 360°C for 10 minutes, quench it, and then age it at 60°C for 5 hours; roll it t...

Embodiment 3

[0042] A high-strength and high-toughness magnesium alloy plate is made of the following components in weight percentage: Li: 11%, Al: 2%, Ag: 1.2%, Sn: 1.0%, Ca: 1.2%, Sr: 0.75%, The balance is Mg.

[0043] The preparation method of the above-mentioned high-strength and high-toughness magnesium alloy plate comprises the following steps:

[0044] (1) Mixing is carried out according to the mass percentage of each component in the alloy, and the raw materials are melted under an argon atmosphere at 800°C to obtain molten metal;

[0045] (2) Cast the molten metal obtained in step (1) to obtain an ingot; then keep the ingot at 360°C for 8 hours under an argon atmosphere to obtain a homogenized ingot;

[0046] (3) After removing the surface oxide skin (peeling and polishing) from the homogenized ingot obtained in step (2), the slab is obtained by extrusion;

[0047] (4) Heat the slab obtained in step (3) at 410°C for 5 minutes, then quench it, and then age it at 80°C for 3 hours;...

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Abstract

The invention discloses a high-strength high-toughness magnesium alloy sheet. The high-strength high-toughness magnesium alloy sheet is composed of, by mass, 7-12% of lithium, 1-6% of aluminum, 0.05-2.0% of silver, larger than zero and smaller than or equal to 1.2% of tin, 0.03-3% of calcium, 0.05-1.5% of strontium, and the balance magnesium. The invention further discloses a preparation method of the high-strength high-toughness magnesium alloy sheet. According to the high-strength high-toughness magnesium alloy sheet and the preparation method thereof, the strength of magnesium alloy is improved by adding the aluminum, and the castability of the alloy is improved; the silver can achieve solution strengthening and can also put off magnesium overaging, and the structure stability and the performance stability are improved; the plasticity of the magnesium alloy can be improved through the tin; the calcium has a melt flame retardant effect and moreover improves the high-temperature creep property of the material; the creep property and the corrosion resistance of the alloy are improved through the strontium; in addition, the calcium and the strontium serve as a grain refiner, so that the strength of the magnesium alloy is effectively improved, and meanwhile, the toughness of the magnesium alloy is improved; and through component design, the machining cost of the magnesium alloy is reduced, and the application range of the magnesium alloy is broadened.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metals, and in particular relates to a high-strength and high-toughness magnesium alloy plate and a preparation method thereof. Background technique [0002] Magnesium alloys have many advantages, such as high specific strength and specific stiffness, good dimensional stability, good thermal conductivity, good electromagnetic shielding properties and vibration resistance, easy recycling, etc., because of this, magnesium alloys are widely used in aerospace, National defense industry, transportation and 3C product industry are the third type of metal structural materials developed after steel and aluminum alloy. In addition, magnesium has a high supranational availability (earth crust: 2 wt.% or 6th; seawater: 1.1 kg / m 3 Or ranked third in dissolved minerals), with the depletion of many metal mineral resources, magnesium is increasingly valued for its rich resources. [0003] However, there is ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/00C22C1/02B21C37/02
CPCB21C37/02C22C1/02C22C23/00
Inventor 纪大伟肖阳解海涛王军武郭晓光王松森
Owner 郑州轻研合金科技有限公司
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