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High-plasticity two-phase yttrium-containing magnesium-lithium-aluminum alloy and preparation method thereof

An aluminum alloy, high plasticity technology, applied in the field of magnesium alloys and their plastic forming, can solve the problems of reduced corrosion resistance and thermal stability of materials, elongation of only 10-25%, and reduced plasticity of magnesium-lithium alloys. Effects of dispersion strengthening and plasticity, low extrusion force, low density

Inactive Publication Date: 2012-01-04
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In recent years, researchers have strived to increase the strength of magnesium-lithium alloys, but methods that can increase strength often lead to a decrease in the plasticity of magnesium-lithium alloys
Chinese patent 201010103173.8 discloses a low-rare-earth high-strength magnesium-lithium alloy and its preparation method. Although the magnesium-lithium alloy of the invention has a tensile strength of 200-260 MPa, its elongation is only 20%
Chinese patent 200710144339.9 discloses a high-strength magnesium-lithium alloy. Although the tensile strength of the alloy in this invention reaches 245-300MPa, the elongation is only 10-25%.
[0003] In the magnesium-lithium alloy, the addition of Li (body-centered cubic) can reduce the axial ratio (c / a value) of the magnesium lattice (hexagonal close-packed), and improve the symmetry of the magnesium alloy lattice, so that its prism and cone The surface-slip system is more easily activated, thereby improving the plasticity of the alloy material, but the addition of a large amount of Li element will not only increase the cost of the alloy, but also reduce the corrosion resistance and thermal stability of the material.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step 1: Casting

[0037] (1) Weigh raw materials according to mass percentage: Li 10.73%, Al 4.49%, Y 0.52%, Zr 0.12%, Mg 84.14%, and put the weighed raw materials into a vacuum induction furnace.

[0038] (2) Put the weighed raw material into a vacuum induction furnace, fill it with argon gas in a vacuum state, and raise the temperature to the melting temperature under the protection of argon gas, and the melting temperature is 680°C; after the metal is completely melted, use Argon gas protection, heat preservation for 15 minutes under stirring, and then pour the melt into a metal mold to obtain an ingot;

[0039] (3) Heat treatment: Homogenize the ingot at 350±10°C for 12 hours.

[0040] Step 2: Equal channel angular extrusion process

[0041] Cut a sample of 22mm×22mm×120mm on the ingot, and at room temperature, coat the mixture lubricant of gasoline and graphite powder on the surface of the sample; the inner angle is φ=90° and the outer angle is Extrude in an eq...

Embodiment 2

[0044] Step 1: Casting

[0045] (1) Weigh raw materials according to mass percentage: Li 10.50%, Al 2.85%, Y 0.57%, Zr 0.18%, Mg 85.90%, and put the weighed raw materials into a vacuum induction furnace.

[0046] (2) Put the weighed raw material into a vacuum induction furnace, fill it with argon gas in a vacuum state, and raise the temperature to the melting temperature under the protection of argon gas, and the melting temperature is 720°C; after the metal is completely melted, use Argon gas protection, heat preservation for 10 minutes under stirring, and then pour the melt into a metal mold to obtain an ingot;

[0047] (3) Heat treatment: Homogenize the ingot at 350±10°C for 12 hours.

[0048] Step 2: Plastic deformation process of traditional extrusion

[0049]Heat the mold with an extrusion ratio of 9.7:1, the heating temperature is 35°C (normal temperature), and keep it warm for 2 hours; coat the surface of the sample with a mixture lubricant of gasoline and graphite p...

Embodiment 3

[0052] Step 1: Casting

[0053] (1) Weigh raw materials according to mass percentage: Li 9.80%, Al 4.50%, Y 0.65%, Zr 0.26%, Mg 84.79%, and put the weighed raw materials into a vacuum induction furnace.

[0054] (2) Put the weighed raw material into a vacuum induction furnace, fill it with argon gas in a vacuum state, and raise the temperature to the melting temperature under the protection of argon gas, and the melting temperature is 700 °C; after the metal is completely melted, use Argon gas protection, heat preservation for 5 minutes under stirring, and then pour the melt into a metal mold to obtain an ingot;

[0055] (3) Heat treatment: Homogenize the ingot at 350±10°C for 16 hours.

[0056] Step 2: Equal channel angular extrusion process

[0057] Cut a sample of 22mm×22mm×120mm from the ingot, and at room temperature, coat the surface of the sample with a mixture lubricant of gasoline and graphite powder, and put it in with an inner angle of φ=90° and an outer angle of ...

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Abstract

The invention discloses high-plasticity two-phase yttrium-containing magnesium-lithium-aluminum alloy and a preparation method thereof. The alloy comprises the following specific components in percentage by weight: 9.50-10.80% of Li, 3.00-5.00% of Al, 0.50-0.70% of Y, 0.10-0.30% of Zr and the balance of Mg; the alloy has the structural characteristics that an alpha phase, a beta phase and a precipitated phase exist at the same time, wherein the alpha phase is a Mg-based solid solution and is in a close-packed hexagonal structure, the beta phase is a Li-based solid solution and is in a body-centered cubic structure, and the precipitated phase is a rare earth compound Al2Y; and the alloy has the characteristics of low density, high plasticity and higher strength. The preparation method disclosed by the invention is a normal-temperature plastic deformation method which combines casting with equal channel angular extrusion or traditional extrusion deformation process; and compared with the traditional high-temperature deformation process, the preparation method has good practicality and is simpler and more convenient to operate, and can be used for effectively lowering the production cost, thus the preparation method has good industrial production prospects.

Description

technical field [0001] The invention relates to a magnesium alloy and its plastic forming technology, in particular to a high-plasticity two-phase yttrium (Y)-containing magnesium-lithium-aluminum (Mg-Li-Al) alloy and a preparation method thereof. Background technique [0002] Magnesium alloy materials are dominated by the addition of lithium elements, that is, magnesium-lithium alloys are formed. The density of magnesium-lithium alloy is only 1.30g / cm 3 ~1.65g / cm 3 , is only 1 / 2 of aluminum alloy, 3 / 4 of traditional magnesium alloy, and is the lightest metal structure material so far. As the lightest metal structure material, magnesium-lithium alloy can reduce the interference of cosmic rays on electronic instruments and equipment, and can meet the needs of aviation and aerospace industries for lightweight materials. Therefore, it will be used in the fields of communication electronics industry, military industry and aerospace transportation be increasingly widely used. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02C22F1/06
Inventor 康志新孔晶侯文婷
Owner SOUTH CHINA UNIV OF TECH
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