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Li-containing lightweight high strength magnesium alloy and preparing method thereof

A magnesium alloy, high-strength technology, applied in the field of lightweight high-strength magnesium alloy and its preparation, can solve the problems of structural weight loss, poor plasticity, high density, etc., and achieve the effect of reducing density, improving plasticity, and refining structure

Active Publication Date: 2018-11-09
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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Problems solved by technology

[0003] The Mg-Y-Nd-Zr alloy system has been paid attention to in the fields of missile military industry and rail transportation because of its good room temperature and high temperature strength, but it also has inherent defects such as high density and poor plasticity due to high rare earth content, making it difficult to Meet the need for structural weight reduction under extreme conditions

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  • Li-containing lightweight high strength magnesium alloy and preparing method thereof
  • Li-containing lightweight high strength magnesium alloy and preparing method thereof
  • Li-containing lightweight high strength magnesium alloy and preparing method thereof

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preparation example Construction

[0051] The present invention also provides a preparation method of Li-containing light-weight high-strength magnesium alloy, comprising the following steps:

[0052] A) carrying out batching of pure Mg, pure Li, Mg-Zr master alloy and Mg-RE master alloy according to the following mass fractions, melting and casting;

[0053] RE = Y, Nd and Gd;

[0054] Y: 4.5~6.5wt%, Nd: 1.5~4.0wt%, Gd: 1.5~4.0wt%, Li: 5~8wt%, Zr: 0.15~1.5wt%, the balance is Mg, and the total amount of rare earth elements is not More than 10wt%

[0055] B) heat-treating or extruding the casting to obtain a Li-containing light-weight high-strength magnesium alloy.

[0056]In the present invention, the pure Mg, the pure Li, the Mg-Zr master alloy and the Mg-RE master alloy are preferably proportioned and then dried. The drying temperature is 100-200° C. and the drying time is 1-2 hours;

[0057] (2) Put the dried pure Mg, pure Li, and Mg-RE master alloy into the crucible and raise the temperature with the fur...

Embodiment 1

[0081] The high-strength heat-resistant magnesium alloy in this embodiment is composed of the following components by mass percentage: Y: 4.5wt%, Nd: 1.5wt%, Gd: 1.5wt%, Li: 5wt%, Zr: 0.5wt%, and the balance is Mg and unavoidable impurities.

[0082] The casting molding preparation of the high-strength heat-resistant magnesium alloy of this embodiment comprises the following steps:

[0083] (1) Align the raw materials of pure Mg, pure Li, Mg-Zr master alloy, and Mg-RE (**wt.%) master alloy in proportion, and then dry them at 100°C for 2 hours. .

[0084] (2) During the preparation process, the melt has been in CO 2 and SF 6 Under the protection of mixed gas, CO 2 with SF 6 The ratio is 99.5:0.5.

[0085] (3) Put the dried pure Mg, pure Li, and Mg-RE (20wt.%) master alloy into a crucible and heat up with the furnace until it is completely melted, and the temperature is controlled at 780°C.

[0086] (4) Heat the melt to 740°C, add the dried Mg-Zr master alloy into the mag...

Embodiment 2

[0092] The high-strength heat-resistant magnesium alloy is prepared according to the preparation method in Example 1, the difference is that the high-strength heat-resistant magnesium alloy in this example is composed of the following components in mass percentage: Y: 6.5wt%, Nd: 1.5wt%, Gd : 1.5wt%, Li: 6wt%, Zr: 0.5wt%, the balance is Mg and unavoidable impurities.

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Abstract

The invention provides an Li-containing lightweight high strength magnesium alloy. The Li-containing lightweight high strength magnesium alloy comprises the following compositions, by mass percentage,4.5-6.5wt% of Y, 1.5-4.0wt% of Nd, 1.5-4.0wt% of Gd, 5-8wt% of Li, 0.15-1.5wt% of Zr, and the balance Mg, wherein, the total amount of the rare earth element does not exceed 10wt%. The Li-containinglightweight high strength magnesium alloy has the lower density in the same material, the precipitation enhancement of the compound containing the rare earth element is uased as the main strengtheningmechanism, the density of the material is reduced by adding the Li element, a novel Mg-RE-Li co-crystal microstructure is formed, and the morphology of the alloy is optimized; and under the premise of remarkably refining the microstructure and improving the plasticity, the performance weakening of the original alloy system is greatly reduced by adding Li in the newly-formed Mg-RE-Li co-crystal microstructure, and the invention provides a preparation method of the Li-containing lightweight high strength magnesium alloy.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a light-weight high-strength magnesium alloy containing Li and a preparation method thereof. Background technique [0002] Magnesium alloys are widely used because of their excellent casting process performance, good plasticity, and good shock absorption performance. With the development of the automobile, electronics, and aviation industries, the application of magnesium alloys has been extended to large components and power systems, which puts forward higher requirements for the strength, plasticity, and damping properties of magnesium alloys. Adding rare earth elements is an effective means to improve the strength and corrosion resistance of magnesium alloys. [0003] The Mg-Y-Nd-Zr alloy system has been paid attention to in the fields of missile military industry and rail transportation because of its good room temperature and high temperature strength, b...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/03C22C23/06C22F1/06
CPCC22C1/03C22C23/00C22C23/06C22F1/06
Inventor 孟健孙伟田政杨强管凯邱鑫李柏顺
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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