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A kind of high-strength high-corrosion-resistant magnesium alloy and preparation method thereof

A magnesium alloy, high corrosion resistance technology, applied in the field of materials, can solve the problems of slightly poor absolute strength and elongation, poor plastic forming ability, poor formability, etc. The effect of crystal nucleation points

Active Publication Date: 2021-05-18
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] At present, industrial general-purpose magnesium alloys are mainly divided into cast magnesium alloys and deformed magnesium alloys. Compared with cast magnesium alloys, deformed magnesium alloys have higher strength, better ductility and more diverse sizes, and are more widely used; deformed magnesium alloys Mg-Al series magnesium alloys are the most widely used alloys; however, there are still problems such as low absolute strength, poor plastic formability and poor corrosion resistance; It is more widely used in forging and extrusion products, such as automobile wheels, aircraft seat brackets, etc.; however, AZ80 magnesium alloy has slightly worse formability and corrosion resistance than AZ31 magnesium alloy, which is also AZ series. , its absolute strength and extensibility are slightly worse than that of aluminum alloy; while the absolute strength of AZ80 is much higher than that of AZ31 magnesium alloy, and at the same time lighter than aluminum alloy, it can better meet the requirements of lightweight; however, using AZ80 magnesium alloy as There are also certain problems to be solved in the materials of profile structural parts; for example, poor formability and poor corrosion resistance; in response to these problems, research and development of new AZ80 modified with excellent characteristics such as good formability, high strength and strong corrosion resistance Magnesium alloy, and study the forming process and performance of the hub prepared by the alloy

Method used

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  • A kind of high-strength high-corrosion-resistant magnesium alloy and preparation method thereof
  • A kind of high-strength high-corrosion-resistant magnesium alloy and preparation method thereof
  • A kind of high-strength high-corrosion-resistant magnesium alloy and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Prepare magnesium ingot, zinc block, aluminum block, manganese chloride particles and Mg-rich La mixed rare earth master alloy, which contains La and Ce 30% by weight percentage in the described Mg-rich La mixed rare earth master alloy, and La / Ce The weight ratio of manganese chloride particles is 2:1; the particle size of manganese chloride particles is 1-3mm;

[0042] The No. 5 flux prepared is 0.2% of the total weight of magnesium ingot, zinc block, aluminum block, manganese chloride and Mg-La-rich mixed rare earth master alloy;

[0043] Under the condition of protective atmosphere, put the magnesium ingot into the smelting resistance furnace to melt, set the temperature of the material to 750±5°C, and obtain the magnesium melt; the protective atmosphere is an argon atmosphere;

[0044] in SF 6 with CO 2 Under the condition of mixed protective atmosphere, the aluminum block is melted in another melting resistance furnace, and the melting temperature is 750±5°C to obt...

Embodiment 2

[0052] Method is with embodiment 1, and difference is:

[0053] (1) prepare magnesium ingot, zinc block, aluminum block and Mg-rich La mixed rare earth master alloy, contain La and Ce 20% by weight percentage in the described Mg-rich La mixed rare earth master alloy, and the weight of La / Ce The ratio is 3:1;

[0054] (2) No. 5 flux is 0.3% of the total weight of magnesium ingot, zinc block, aluminum block and Mg-La-rich mixed rare earth master alloy; no manganese chloride is added;

[0055] (3) Refining at 750±5°C for 35 minutes after adding the mixed solution to the magnesium melt, then standing for 40 minutes, and cooling down to 695°C during the standing process;

[0056] (4) In a mixed protective atmosphere, SF 6 with CO 2 The volume ratio is 1:4;

[0057] (5) The equal area corrosion weight of the corrosion test is 16mg / cm 2 ;

[0058] (6) The temperature of the first level homogenization treatment is 200°C, and the time is 7h; the temperature of the second level ho...

Embodiment 3

[0062] Method is with embodiment 1, and difference is:

[0063] (1) The Mg-La-rich mixed rare earth master alloy contains a total of 25% of La and Ce by weight percentage;

[0064] (2) No. 5 flux is 0.4% of the total weight of magnesium ingot, zinc block, aluminum block, manganese chloride and Mg-La-rich mixed rare earth master alloy;

[0065] (3) After the mixed solution is added to the magnesium melt, it is refined at 750±5°C for 40 minutes, then it is left to stand for 0 minutes, and the temperature is lowered to 695°C during the standing process;

[0066] (4) In a mixed protective atmosphere, SF 6 with CO 2 The volume ratio is 1:5;

[0067] (5) The equal area corrosion weight of the corrosion test is 13mg / cm 2 ;

[0068] (6) The temperature of the first level homogenization treatment is 220°C, and the time is 6h; the temperature of the second level homogenization treatment is 400°C, and the time is 12h;

[0069] (7) The ingot is kept at 310°C for 1.5h, and then hot-e...

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Abstract

A high-strength and high-corrosion-resistant magnesium alloy and a preparation method thereof, the magnesium alloy composition contains 7.0-8.5% of Al, 0.3-0.5% of Zn, 0-0.1% of Mn, 1.5-2.0% of La-rich mixed rare earth, and the balance is Mg; the weight ratio of La / Ce in the La-rich mixed rare earth is 2:1~3:1; the tensile strength is 350~380MPa, and the yield strength is 250~290MPa; the method is: (1) prepare raw materials; (2) in a protective atmosphere (3) Under the condition of mixed protective atmosphere, other raw materials are melted to obtain a mixed melt; (4) Under the condition of mixed protective atmosphere, the mixed melt is added to the magnesium melt Refining, standing and cooling to make magnesium alloy melt; (5) casting by electromagnetic semi-continuous casting system; (6) performing double-stage homogenization treatment; (7) performing hot extrusion after heat preservation at 280-320°C. The method of the invention has simple process and low cost, and the product has good performance.

Description

technical field [0001] The invention belongs to the technical field of materials, in particular to a high-strength and high-corrosion-resistant magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium alloy is by far the lightest metal structure material, its density is only equivalent to 2 / 3 of aluminum, 1 / 4 of steel, which makes it have high specific strength and specific stiffness; in addition, magnesium alloy also has good damping Excellent properties such as high mechanical properties, machinability, thermal conductivity, and easy recycling and regeneration make it widely used in automotive, aerospace, 3C, national defense and other fields. [0003] At present, industrial general-purpose magnesium alloys are mainly divided into cast magnesium alloys and deformed magnesium alloys. Compared with cast magnesium alloys, deformed magnesium alloys have higher strength, better ductility and more diverse sizes, and are more widely used; deformed...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/02C22C1/03B22D11/115C22F1/06B21C23/02
Inventor 乐启炽廖启宇程春龙蒋燕超胡成路陈星瑞
Owner NORTHEASTERN UNIV LIAONING
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