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Reinforced magnesium-lithium alloy of long-period structure and preparation method of reinforced magnesium-lithium alloy

A long-period structure, magnesium-lithium alloy technology, applied in the field of metal materials, can solve problems such as limiting the popularization and application of magnesium-lithium alloys, increasing the production cost of magnesium-lithium alloys, etc., and achieving the effects of increasing the melt refining process, low density and simple operation

Inactive Publication Date: 2017-07-18
苏州轻金三维科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of the above problems limits the popularization and application of magnesium-lithium alloys, and increases the production cost of magnesium-lithium alloys

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] This embodiment provides a long-period structure-reinforced magnesium-lithium alloy, the composition and mass percentage of which are: 11wt% Li, 1wt% Y, 0.2wt% Zn, 0wt% Zr, impurity elements Si, Fe, Cu and Ni The total amount is less than 0.02wt%, and the balance is Mg.

[0062] The preparation method of the magnesium-lithium alloy includes two process steps of smelting in the atmosphere and subsequent heat treatment in a common furnace.

[0063] Among them, the previous smelting process is in SF 6 and CO 2 Under the condition of mixed gas protection, without vacuum environment, the steps are as follows:

[0064] (1) Baking material: Take pure Mg, Mg-Y master alloy, pure Zn, Mg-Zr master alloy and Li block respectively, weigh lithium salt protective flux and 2% refining flux according to the mass of the prepared alloy, Then, the above-mentioned raw materials (except Li blocks) were preheated at 200° C. for more than 3 hours; the lithium salt protection flux was mixed...

Embodiment 2

[0075] This embodiment provides a long-period structure-reinforced magnesium-lithium alloy whose composition and mass percent are: 16wt% Li, 5wt% Y, 2wt% Zn, 0.6wt% Zr, impurity elements Si, Fe, Cu and Ni The total amount is less than 0.02wt%, and the balance is Mg.

[0076] The preparation method of the magnesium-lithium alloy includes two process steps of smelting in the atmosphere and subsequent heat treatment in a common furnace.

[0077] Among them, the previous smelting process is in SF 6 and CO 2 Under the condition of mixed gas protection, without vacuum environment, the steps are as follows:

[0078] (1) Baking material: Take pure Mg, Mg-Y master alloy, pure Zn, Mg-Zr master alloy and Li block respectively, weigh lithium salt protection flux and 6% refining flux according to the mass of the prepared alloy, Then, preheat all the above-mentioned raw materials at 250° C. for more than 3 hours; the lithium salt protective flux is mixed with LiCl and LiF with a mass rat...

Embodiment 3

[0089] This embodiment provides a long-period structure-reinforced magnesium-lithium alloy. The components and their mass percentages are: 13.5wt% Li, 3wt% Y, 1.1wt% Zn, 0.3wt% Zr, impurity elements Si, Fe, Cu and The total amount of Ni is less than 0.02wt%, and the balance is Mg.

[0090] The preparation method of the magnesium-lithium alloy includes two process steps of smelting in the atmosphere and subsequent heat treatment in a common furnace.

[0091] Among them, the previous smelting process is in SF 6 and CO 2 Under the condition of mixed gas protection, without vacuum environment, the steps are as follows:

[0092] (1) Baking material: Take pure Mg, Mg-Y master alloy, pure Zn, Mg-Zr master alloy and Li block respectively, weigh lithium salt protection flux and 4% refining flux according to the mass of the prepared alloy, Then, the above-mentioned raw materials (except Li blocks) were preheated at 225° C. for more than 3 hours; the lithium salt protection flux was m...

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Abstract

The invention provides a reinforced magnesium-lithium alloy of a long-period structure and a preparation method of the reinforced magnesium-lithium alloy. The magnesium-lithium alloy is composed of, by weight percentage, 11-16% of Li, 1-5% of Y, 0.2-2% of Zn, 0-0.6% of Zr and the balance Mg and inevitable impurities, wherein the total amount of Si, Fe, Cu and Ni is less than 0.02%. The preparation method of the magnesium-lithium alloy comprises the steps of smelting under the atmospheric environment and thermal treatment in a common furnace, wherein the smelting process comprises the steps of drying materials, smelting magnesium, adding Y, adding Zn, adding Zr, adding Li, performing refining and performing casting. Double-stage solution treatment is mainly adopted in the thermal treatment process, that is, 300-400 DEG C solution treatment is conducted for 2-10 h, then 200-300 DEG C solution treatment is conducted for 2-6 h, and the cast alloy with the LPSO structural phase is obtained through phase transformation. According to the reinforced magnesium-lithium alloy and the preparation method, the Y element and the Zn element are added to the magnesium-lithium alloy, the LPSO structure phase is introduced into a magnesium-lithium alloy substrate, and the cast magnesium-lithium alloy material with the low density, high strength and good thermal resistance is prepared.

Description

technical field [0001] The technical field of metal materials of the present invention, in particular, relates to a magnesium alloy and a preparation method thereof, in particular to a long-period structurally reinforced magnesium-lithium alloy added with Zn, Y and Zr elements and a preparation method thereof. Background technique [0002] Magnesium-lithium alloy is currently the lightest metal structure material in engineering applications, with a density of 1.35~1.65g / cm 3 Between, significantly lower than the density of ordinary magnesium alloys (about 1.8g / cm 3 ). [0003] Since Li has a body-centered cubic (bcc) structure, the addition of Li can make the lattice axis ratio of Mg with a hexagonal close-packed (hcp) structure ( c / a ) value becomes smaller, and as the Li content increases to a certain extent, the alloy structure transforms into a bcc structure. According to the Mg-Li binary phase diagram, when the Li content is below 5.7wt%, the alloy is α -Mg (soli...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/03C22C1/06C22F1/06
CPCC22C23/00C22C1/03C22C1/06C22F1/06
Inventor 刘文才李俊锋
Owner 苏州轻金三维科技有限公司
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