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Mg-Li magnesium alloy and preparation method thereof

A technology of magnesium alloys and polymers, applied in prosthetics, coatings, medical science, etc., can solve the problems of increased strength of alloys at room temperature, reduced strength of alloys and corrosion resistance, etc., to improve low plasticity, make up for strength and Insufficient effect of corrosion resistance

Active Publication Date: 2013-03-20
PEKING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the addition of Li element inevitably reduces the strength and corrosion resistance of the alloy, while the addition of a small amount of Al element forms Al-containing intermetallic compound phases at the grain boundaries and within the grains of the matrix. Due to the small size and The distribution is relatively uniform, so the room temperature strength of the alloy is increased

Method used

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  • Mg-Li magnesium alloy and preparation method thereof
  • Mg-Li magnesium alloy and preparation method thereof
  • Mg-Li magnesium alloy and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0046] Example 1. Preparation of Mg-Li-(Al, RE) alloy

[0047] The test materials used pure Mg (99.9wt.%), Li (99.9wt.%), Al (99.95wt.%) and RE (99.8wt.%).

[0048] Weigh the materials according to the following proportions:

[0049] (A) Li 3.3% and the balance of Mg; (b) Li 3.3%, Al 1% and the balance of Mg; (c) Li 8.5% and the balance of Mg; (d) Li 8.5%, Al 1% And the balance of Mg; (e) Li 3.5%, Al 2%, RE 2% and the balance of Mg; (f) Li 3.5%, Al 4%, RE 2% and the balance of Mg; (g) Li 8.5%, Al 2%, RE 2% and the balance of Mg; (h) Li 8.5%, Al 2%, RE 3.5% and the balance of Mg;

[0050] Place the small magnesium ingot in a crucible and melt it under the protection of argon, then add the remaining components weighed above to the molten Mg, stir for 5 minutes, quickly heat the melt to about 720°C, keep it warm and keep it still After 30 minutes, pour the melt into a mold preheated to 300℃, polish the gate, anneal at 250℃ for 12 hours, and extrude at 280℃, the extrusion rate is 0.5m / m...

Embodiment 2

[0053] Example 2. Room temperature tensile properties of Mg-Li-(Al, RE) alloy

[0054] The Mg-Li-(Al, RE) alloy prepared in Example 1 was prepared according to the ASTM-E8-04 tensile test standard to prepare tensile samples, SiC water-resistant sandpaper was polished to 2000#, and the room temperature tensile test was carried out using a universal tensile testing machine , The stretching speed is 1mm / min.

[0055] The room temperature tensile properties of the Mg-Li-(Al, RE) alloy prepared by the invention are as follows figure 2 Shown by figure 2 It can be seen that with the increase of Li content, the yield strength and tensile strength of the alloy have decreased, and the elongation has been greatly improved. The addition of aluminum improves the mechanical strength and elongation of the alloy, and the addition of rare earth elements improves the yield strength and tensile strength of the alloy, but has little effect on the elongation.

Embodiment 3

[0056] Example 3 Corrosion resistance of Mg-Li-(Al, RE) alloy

[0057] Wire the Mg-Li-(Al, RE) alloy prepared in Example 1 into The disc-shaped sample of the sample was polished with sandpaper to 2000#. The electrochemical test was then carried out in Hank’s simulated body fluid at 37°C.

[0058] The corrosion potential-corrosion current curve of the Mg-Li-(Al, RE) alloy obtained by the present invention is as follows image 3 Shown.

[0059] The corrosion potential-corrosion current curve of the Mg-Li-(Al, RE) alloy prepared by the invention is as follows image 3 As shown, the analysis of the figure shows that for the alloy without the addition of RE element, as the content of Li element increases, the corrosion resistance of the alloy decreases, which is manifested as a decrease in corrosion potential and an increase in corrosion current; the addition of Al element causes The decrease of alloy corrosion current improves the corrosion resistance of alloy. For magnesium alloys wi...

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Abstract

The invention discloses an Mg-Li magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by weight: 0-10% (excluding 0) of Li and the balance of Mg. The preparation method of the magnesium alloy comprises the following steps: adding one of the materials shown as (1) -(6) into molten Mg to obtain a melt: (1) Li; (2) Li and Al; (3) Li, Al and mixed rare earths; (4) Li and microelements; (5) Li, Al and microelements; and (6) Li, Al, mixed rare earths and microelements; smelting the melt to obtain a molten material; and extruding the molten material to obtain the magnesium alloy. The Mg-Li-(Al, RE) alloy for biodegradable intravascular stents disclosed by the invention adopts lithium with favorable biocompatibility as the alloying element, thereby overcoming the defect of low plasticity in the traditional magnesium alloy.

Description

Technical field [0001] The invention relates to a Mg-Li series magnesium alloy and a preparation method thereof, and belongs to the field of medical magnesium alloy materials and preparation methods thereof. Background technique [0002] Bone repair and vascular stent materials have a huge market demand. According to statistics, there are 1.8 to 2 million joint transplants worldwide each year, and more than 1 million vascular stents are transplanted into patients for treatment of arteriosclerosis each year. [0003] Vascular stent materials widely used clinically mainly include 316L stainless steel, Co-Cr alloy, pure titanium, Ni-Ti alloy, Pt-Ir alloy and metal Ta. Because these materials are inert materials and cannot be degraded by themselves in the body, they need to be removed by a second operation, which increases treatment costs and patient risks. In addition, long-term retention of vascular stents made of these inert metal materials in the body will bring unpredictable nega...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/02A61L27/04A61L27/28
Inventor 郑玉峰周维瑞成艳
Owner PEKING UNIV
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