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High-strength cast magnesium-lithium alloy and preparation method thereof

A technology for casting magnesium and lithium alloys, which is applied in high-strength casting magnesium alloys and their preparation, Zn, high-strength magnesium-lithium alloys with Al, Y and Ca elements added and their preparations, and can solve the problems that cannot reflect ordinary magnesium-lithium, Problems such as the production of complex structure castings and the low purity of the alloy melt can be achieved by increasing the melt refining process, improving the mechanical properties, and increasing the purity

Active Publication Date: 2016-11-23
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lithium content in this alloy is low and the alloy density is high (more than 1.75g / cm 3 ), and is a single-phase α-Mg structure, the alloy has a low elongation and cannot reflect the advantages of low density of ordinary magnesium-lithium alloys; and the preparation method of the alloy needs to be completed under vacuum conditions, and the purification of the alloy melt cannot be performed , the purity of the alloy melt is low, which will reduce the mechanical properties of the alloy; at the same time, the magnesium-lithium alloy melt cannot be produced with complex structure castings under vacuum conditions, which limits its popularization and application

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a high-strength cast magnesium-lithium alloy, the composition and mass percentage of which are: 7wt.%Li, 8.5wt.%Al, 3.2wt.%Zn, 0.2wt.%Y, 1wt.%Ca, The total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0051] The preparation method of the magnesium-lithium alloy includes two process steps of smelting and subsequent heat treatment.

[0052] Among them, the previous smelting process is in SF 6 And CO 2 It is carried out under the protection of mixed gas without a vacuum environment. The steps are as follows:

[0053] (1) Baking material: respectively take pure Mg, pure Al, pure Zn, Mg-Y master alloy, pure Ca and Li rods, weigh the lithium salt protection flux and 3wt.% of the refined flux according to 10% of the prepared alloy mass , And then preheat all the above-mentioned raw materials at 180°C for 3 hours; the lithium salt protection flux is made by mixing LiCl and LiF with a mass ratio of 5:3; the refi...

Embodiment 2

[0064] This embodiment provides a high-strength cast magnesium-lithium alloy composition and its mass percentages are: 12wt.%Li, 4.2wt.%Al, 6.5wt.%Zn, 1.1wt.%Y, 0wt.%Ca, The total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0065] The preparation method of the magnesium-lithium alloy includes two process steps of smelting and subsequent heat treatment.

[0066] Among them, the previous smelting process is in SF 6 And CO 2 It is carried out under the protection of mixed gas without a vacuum environment. The steps are as follows:

[0067] (1) Baking material: respectively take pure Mg, pure Al, pure Zn, Mg-Y master alloy, pure Ca and Li rods, weigh 15% of the prepared alloy mass, lithium salt protection flux and 3wt.% refining flux , And then preheat all the above-mentioned raw materials at 250°C for 3 hours; the lithium salt protection flux is made by mixing LiCl and LiF with a mass ratio of 5:3; the refining flux has a mass ratio of ...

Embodiment 3

[0079] This embodiment provides a high-strength cast magnesium-lithium alloy composition and its mass percentages: 9.5wt.%Li, 6.3wt.%Al, 4.8wt.%Zn, 0.6wt.%Y, 0.5wt.% Ca, the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0080] The preparation method of the magnesium-lithium alloy includes two process steps of smelting and subsequent heat treatment.

[0081] Among them, the previous smelting process is in SF 6 And CO 2 It is carried out under the protection of mixed gas without a vacuum environment. The steps are as follows:

[0082] (1) Baking material: respectively take pure Mg, pure Al, pure Zn, Mg-Y master alloy, pure Ca and Li rods, weigh the lithium salt protection flux and 3wt.% of the refined flux according to 12.5% ​​of the prepared alloy mass Then, preheat all the above-mentioned raw materials at 220°C for 3 hours; the lithium salt protection flux is made by mixing LiCl and LiF with a mass ratio of 5:3; the refining flux...

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Abstract

The invention provides a high-strength cast magnesium-lithium alloy and a preparation method thereof. The alloy contains the following components in percentage by weight: 7-12% of Li, 4.2-8.5% of Al, 3.2-6.5% of Zn, 0.2-1.1% of Y, 0-1% of Ca and the balance of Mg and unavoidable impurities. The preparation method comprises a step of smelting and a step of thermal treatment. According to the invention, the elements Al, Zn, Y and Ca are added into the magnesium-lithium alloy to hinder the melt combustion; a long-period structure is introduced into the solidification structure of the magnesium-lithium alloy as a strengthening phase; and more strengthened precipitated phases are obtained after follow-up thermal treatment so as to prepare the high-strength cast magnesium-lithium alloy with relatively high thermal stability.

Description

Technical field [0001] The invention relates to a high-strength cast magnesium alloy and a preparation method thereof, in particular to a high-strength magnesium-lithium alloy added with Al, Zn, Y and Ca elements and a preparation method thereof, and belongs to the technical field of metal materials. Background technique [0002] Magnesium alloy has the advantages of low density, wide sources, high specific strength and specific rigidity, and is known as the "green engineering material of the 21st century". However, ordinary magnesium alloy materials still have problems such as high density and low plasticity, which are difficult to meet the requirements of use. Magnesium-lithium alloy is an ultra-light magnesium alloy with higher specific strength and specific rigidity than ordinary magnesium alloys. The density of ordinary magnesium-lithium alloys is about 1.25-1.65g / cm 3 , Is about one-third lighter than ordinary magnesium alloys. Therefore, magnesium-lithium alloys have a wid...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C23/02C22C1/03C22F1/06C22C1/06
CPCC22C1/03C22C1/06C22C23/00C22C23/02C22F1/06
Inventor 刘文才吴国华赵炯丁文江
Owner SHANGHAI JIAO TONG UNIV
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