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Magnesium-lithium-aluminum-neodymium alloy

A magnesium alloy and alloy technology, applied in the field of magnesium alloys, can solve the problems of insufficient comprehensive mechanical properties such as limitation and strength, and achieve the effects of inhibiting grain growth, enhancing dislocation pinning effect, and avoiding component segregation.

Inactive Publication Date: 2014-11-19
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] However, although Mg-Li alloy has low density and good shape, its comprehensive mechanical properties such as strength are insufficient, and its application in industrial production and high-tech fields is still limited; therefore, it is necessary to develop a new type of ultra-light, high-strength, high-plastic alloy , magnesium-lithium alloy

Method used

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Examples

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Embodiment 1

[0054] The method for preparing magnesium-lithium-aluminum-neodymium alloy in this embodiment comprises the following steps:

[0055] First, select industrial pure magnesium, industrial pure lithium, industrial pure aluminum, Mg-25% Nd rare earth master alloy, and adjust the ratio of various raw materials to make it consistent with Table 1 Example 1;

[0056] Second, evacuate the vacuum induction furnace and fill it with argon protection, use a crucible to hold all raw materials except industrial pure lithium, then place it in the vacuum induction furnace to heat, melt and stir evenly, and finally add industrial pure lithium to keep the alloy completely melted Afterwards, stir and remove slag;

[0057] The 3rd, take out the crucible water cooling that fills magnesium alloy melt;

[0058] Fourth, the alloy obtained by wagon processing is suitable for the size of the extrusion barrel of the extruder and the oxide layer on the surface of the alloy obtained by smelting is removed...

Embodiment 2

[0063] The difference between this example and Example 1 is that the content of each component in this example is the same as that of Example 2 in Table 1.

Embodiment 3

[0065] The difference between this example and Example 1 is that the content of each component in this example is the same as that of Example 3 in Table 1.

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Abstract

The invention discloses a magnesium-lithium-aluminum-neodymium alloy. The magnesium-lithium-aluminum-neodymium alloy comprises the following components in percentage by mass: 8.97-9.36% of Li, 3.2-3.45% of Al, 0.4-2.75% of Nd, inevitable impurities not greater than 0.3%, and the balance of magnesium. The magnesium alloy is prepared by the following method: firstly, the raw materials are selected in proportion, and are mixed and smelted to obtain an alloy melt; then, the alloy melt is cooled by water to obtain a cast magnesium alloy; the cast magnesium alloy is heated up to 250-300 DEG C, and the temperature is kept for 8-10 hours; and finally, a finished product is obtained through extrusion. A certain quantity of rare earth Nd is added in an Mg-Li alloy, and is enriched in front of a solid-liquid interface, so that the components are tool cold, the growth of crystal grains is restrained, and the crystal grains are refined; a proper amount of Al is further added in the alloy; Al and Nd form Al2Nd and Al11Nd3 compound phases with high melting point and high heat stability in the smelting process; and the phase generates grain boundary pinning and dislocation in the heat working process to block the growth of dynamically recrystallized grains so as to further refine the crystal grains.

Description

technical field [0001] The invention belongs to the field of magnesium alloys and relates to a novel magnesium-lithium-aluminum-neodymium alloy. Background technique [0002] Magnesium alloys have excellent comprehensive properties and are widely used. However, magnesium alloys have a hexagonal close-packed structure (HCP), and their mechanical properties such as room temperature shaping and strength are poor. [0003] In order to improve the shaping of magnesium alloy, lithium element is usually added to the magnesium alloy matrix, and the density of metal lithium is 0.534g / cm 3 , lower than magnesium, can further reduce the density of the alloy; and when the lithium content in the alloy is 5.3-10.7% (weight ratio), the magnesium alloy undergoes a phase transition and exists in the form of α-Mg and β-Li. Since the β-Li phase is a body-centered cubic structure (BCC), it has many slip systems that can be activated at room temperature, and its plasticity is significantly bett...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/02
Inventor 彭晓东许天才谢卫东姜军伟魏国兵
Owner CHONGQING UNIV
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