Quasi crystal phase fortified magnesium lithium alloy and its preparation method

A technology of magnesium-lithium alloy and quasi-crystalline phase, which is applied in the field of high-strength magnesium-lithium alloy and its preparation, can solve the problems of low density and strength, and achieve good plasticity and simple processing technology.

Active Publication Date: 2007-04-18
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a quasicrystalline phase strengthened magnesium-lithium alloy and its preparation method to solve the problems of strengthening magnesium-lithium alloys. By reas

Method used

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  • Quasi crystal phase fortified magnesium lithium alloy and its preparation method
  • Quasi crystal phase fortified magnesium lithium alloy and its preparation method
  • Quasi crystal phase fortified magnesium lithium alloy and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] I), alloy composition

[0031] Configure 15 kilograms of lithium-containing magnesium alloy materials according to the following proportions, and the elements taken out are: 1200 grams of lithium (Li), 480 grams of zinc (Zn), 375 grams of magnesium-yttrium master alloy (Mg-24%Y) and the balance Magnesium (Mg). In terms of weight percentage, the alloy composition is Mg-8%Li-3.2Zn-0.6Y.

[0032] II), alloy smelting and casting

[0033] The alloy is smelted in a 15 kg capacity crucible and electric resistance furnace. The crucible and casting molds are made of mild steel. Taking Example 1 as an example, the smelting and casting process of the alloy will be described in detail below.

[0034] 1) Set the target temperature of the crucible to 720°C and start heating; then preheat various ingredients such as pure magnesium, pure zinc, magnesium-yttrium intermediate alloy, pure lithium, etc. 2% covering agent (LiCl and LiF, weight ratio of 3:1) was baked in an oven; the ca...

Embodiment 2

[0050] I), alloy composition

[0051] Configure 15 kilograms of lithium-containing magnesium alloy materials according to the following proportions, and the elements taken out are: 1200 grams of lithium (Li), 975 grams of zinc (Zn), 750 grams of magnesium-yttrium master alloy (Mg-24%Y) and the balance Magnesium (Mg). In terms of weight percentage, the alloy composition is Mg-8%Li-6.5Zn-1.2Y.

[0052] II), alloy smelting and casting

[0053] The smelting and casting of reference embodiment 1. The difference is that the zinc (Zn) and yttrium (Y) contents of the two are different.

[0054] III), hot extrusion processing

[0055] Referring to the extrusion process of Example 1.

[0056] IV), microstructure characterization

[0057] Refer to the microstructure characterization of Example 1. The main phases in the alloy are α-Mg, β-Li, LiMgZn, Mg 3 Zn 6 Y (quasicrystalline phase I-phase) and Mg 3 Zn 3 Y (W-phase), the corresponding X-ray spectrum is listed on the accompan...

Embodiment 3

[0061] I), alloy composition

[0062] Configure 15 kilograms of lithium-containing magnesium alloy materials according to the following proportions. The elements taken out are: lithium (Li) 1200 grams, zinc (Zn) 1620 grams, magnesium yttrium master alloy (Mg-24%Y) 1187 grams and the balance Magnesium (Mg). In terms of weight percentage, the alloy composition is Mg-8%Li-10.8Zn-1.9Y.

[0063] II), alloy smelting and casting

[0064] The smelting and casting of reference embodiment 1. The difference is that the zinc (Zn) and yttrium (Y) contents of the two are different.

[0065] III), hot extrusion processing

[0066] Referring to the extrusion process of Example 1.

[0067] Iv), microstructure characterization

[0068] Refer to the microstructure characterization of Example 1. The main phases in the alloy are α-Mg, β-Li, LiMgZn, Mg 3 Zn 6 Y (quasicrystalline phase I-phase) and Mg 3 Zn 3 Y(W-phase), the corresponding X-ray spectrum is listed on accompanying drawing 1;...

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Abstract

The invention relates to Mg-Li alloy with high strength and its preparation techniques. It especially relates to Mg-Li alloy strengthened by quasi-crystalline phase and its preparation techniques, which can solve problems of alloy strengthening. Mg-Li alloy with low density, high strength and good plasticity is prepared by reasonable choosing of alloy elements and introducing quasi-crystalline phase into alloy base. The alloy is two-phase alloys of Mg-Li alloy in alpha-Mg and beta-Li phase areas. Component and content of the alloy are 5.5-11.5% Li, 0.5-15% Zn, 0.1-8% Y, and the allowances are Mg, in which percent is weight proportion. The alloy is made by melting and subsequent processing of hot extrusion and its crafts are simple and convenient to operate. Properties of materials are as follows: tensile strength is sigma b=200-300MPa, yield strength is sigma 0.2=150-260MPa, elongation percentage isdelta=17-65% and density is 1.34-1.83g/cm3.

Description

technical field [0001] The invention relates to a high-strength magnesium-lithium alloy and its preparation technology, in particular to a deformed magnesium-lithium alloy material with low density, high strength and good plasticity—a quasi-crystalline phase-strengthened magnesium-lithium alloy and a method for preparing the alloy material. Background technique [0002] As a new type of metal material, magnesium alloy has the advantages of low density, high specific strength and specific stiffness. Using lithium (density 0.534g / cm 3 ) alloying can not only further reduce its density, but also increase the plasticity of the hexagonal close-packed magnesium alloy, which makes Mg-Li alloys have potential wide application prospects in high-tech fields such as aerospace and automobiles. For Mg-Li alloy, when the Li content is lower than 5.5%, its structure is α-Mg solid solution formed by Li dissolving in Mg lattice. When the Li content is higher than 5.5wt.%, the main phases a...

Claims

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Application Information

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IPC IPC(8): C22C23/00C22C1/03B22D21/04C22F1/06C22C1/06B21C23/00
Inventor 许道奎韩恩厚刘路高国忠陈荣石
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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