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High-strength ultra-light two-phase structure magnesium-lithium alloy plate and preparation method thereof

A magnesium-lithium alloy and phase structure technology, applied in the field of metallurgical materials, can solve the problems of low alloy strength, achieve the effects of reducing plate defects, uniform size, and realizing dynamic recrystallization

Active Publication Date: 2017-06-13
D MAG KUNSHAN NEW MATERIAL TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the patent application number 201110266610.2, a high-plastic magnesium-lithium alloy containing Y element and its preparation method are announced. Although the high plasticity of the alloy is guaranteed, the strength of the alloy is still very low, which is 145-175MPa

Method used

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  • High-strength ultra-light two-phase structure magnesium-lithium alloy plate and preparation method thereof
  • High-strength ultra-light two-phase structure magnesium-lithium alloy plate and preparation method thereof
  • High-strength ultra-light two-phase structure magnesium-lithium alloy plate and preparation method thereof

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preparation example Construction

[0036] The preparation method of the covering agent and refining agent in the embodiment of the present invention is to heat, melt and stir evenly after preparing each raw material, then casting and cooling into flakes, and finally grinding into powder and sealing for later use.

[0037]Before the warm rolling in the embodiment of the present invention, both the slab and the roll are preheated. The preheating temperature of the slab, that is, the rolling temperature, is 150-200°C, and the preheating time is 30-60min. In order to achieve constant temperature rolling, the roll is preheated The temperature is the same as the rolling temperature, and the preheating time is 2-3h.

[0038] The performance test in the embodiment of the present invention adopts the national standard GB / T6397-1986, and the tensile rate is 1mm / min.

[0039] The equipment used for tissue observation in the embodiment of the present invention is a LEICA-DMR metallographic microscope.

[0040] The equipme...

Embodiment 1

[0045] Prepare magnesium metal, lithium metal, aluminum metal, zinc metal and Mg-25%Y master alloy as raw materials;

[0046] Dry each raw material at 150±5°C for 30 minutes, then place the metal magnesium in a crucible and raise the temperature to 720±5°C, and form a magnesium melt after the metal magnesium is completely melted;

[0047] Place the magnesium melt under an argon protective atmosphere, place the dried Mg-25%Y master alloy, metal aluminum and metal zinc in the magnesium melt in turn, and spray a covering agent to cover the surface of the magnesium melt, and control the temperature at 710°C and stirring until all the metal in the crucible is melted to form a primary alloy melt;

[0048] Under the protective atmosphere of argon, the temperature of the primary alloy melt was lowered to 670 ° C, and the metal lithium wrapped in aluminum foil was pressed into the primary alloy melt with a bell jar, and the covering agent was sprayed to cover the surface of the magnesi...

Embodiment 2

[0054] Method is with embodiment 1, and difference is:

[0055] (1) The raw materials were dried at 150±5°C for 60 minutes;

[0056] (2) After spraying the covering agent, control the temperature to 715°C;

[0057] (3) Cool the primary alloy melt to 680°C; add refining agent and stir up and down for 20s;

[0058] (4) The secondary alloy melt is left to stand for 9 minutes, and the temperature is controlled at 680°C; the composition of the magnesium-lithium alloy ingot is Li10.0%, Al 3.3%, Zn 2.0%, Y 0.15%, and the balance is Mg and impurities ;

[0059] (5) Heating the magnesium-lithium alloy ingot to 275°C for 7 hours;

[0060] (6) The warm rolling temperature is 200°C, the total reduction is 80%, the rolling speed is 2.5mm / s, and the total rolling passes are 20 passes;

[0061] (7) The rolled magnesium-lithium alloy plate is heated to 270°C and kept for 28 hours to complete the solution treatment; the tensile deformation of the stretching and leveling treatment is 3%;

...

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Abstract

The invention relates to a high-strength ultra-light two-phase structure magnesium-lithium alloy plate and a preparation method thereof, and belongs to the technical field of material metallurgy, wherein the plate comprises, by mass, 5.7-10.0% of Li, 2.5-3.5% of Al, 1.2-2.0% of Zn, 0.1-0.3% of Y, and the balance of Mg and impurities, has the density of 1.50-1.60 g / cm<3>, and has the tensile strength of more than or equal to 270 MPa. The preparation method comprises: (1) preparing raw materials; (2) carrying out drying treatment on the raw materials, and melting metal magnesium; (3) adding an Mg-Y interalloy, aluminum and zinc, spraying a covering agent, controlling the temperature, and stirring; (4) cooling, pressing metal lithium into the obtained material, spraying a covering agent, stirring, adding a refining agent, and carrying out stirring refining; (5) standing, and then casting; (6) carrying out homogenization treatment; (7) carrying out milling surface processing, and carrying out constant temperature reciprocating warm rolling; and (8) carrying out low temperature long time solution treatment, carrying out air cooling, and carrying out room temperature stretching leveling treatment. With the method of the present invention, the strength of the magnesium-lithium alloy is substantially improved, and the magnesium-lithium alloy plate with characteristics of low density and good plasticity is obtained.

Description

technical field [0001] The invention belongs to the technical field of metallurgical materials, and particularly designs a high-strength and ultra-light two-phase structure magnesium-lithium alloy plate and a preparation method thereof. Background technique [0002] Magnesium-lithium alloy is currently the lightest alloy material on the earth, with a density of 1.35-1.65g / cm 3 , about 1 / 2 of the density of ordinary aluminum alloys, and 3 / 4 of the density of ordinary magnesium alloys. Magnesium-lithium alloy has many advantages such as low density, high specific strength, high specific stiffness, good resistance to high-energy particle penetration, excellent electromagnetic shielding performance, good welding performance and excellent cold forming ability. , communication, 3C electronic products and other fields have broad application prospects. In recent years, the world's industrial production has required energy saving, emission reduction, energy consumption reduction, a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03C22C1/06C22B9/10C22F1/06
CPCC22B9/006C22B9/10C22C1/03C22C1/06C22C23/00C22F1/06
Inventor 乐启炽唐岩崔建忠涂季冰
Owner D MAG KUNSHAN NEW MATERIAL TECH CO LTD
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