High-strength and heat-resistance Mg-Zn-Al-Y-Sb magnesium alloy and preparation method thereof

A magnesium alloy, heat-resistant technology, applied in the field of magnesium alloy materials, can solve the problems of increasing the cost of rare earth alloys, inconspicuous improvement in heat resistance, reduction, etc., and achieve the improvement of room temperature and high temperature mechanical properties. The effect of simple operation of processing technology

Inactive Publication Date: 2018-12-18
JIANGSU UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of a large amount of rare earths increases the cost of the alloy, which is not conducive to commercial applications.
Moreover, since the formation of a large number of rare earth phases in the alloy reduces the content of solute on the matrix, when the temperature increases, the dislocation slip velocity increases, and the strength of the alloy, especially the tensile strength, decreases significantly with the increase of temperature, The alloy exhibits low heat resistance and the aging treatment does not significantly improve the heat resistance
Although reducing the content of rare earth in the alloy can increase the concentration of solute in the matrix, but at the same time it will lead to the increase of the network second phase, which will reduce the plasticity of the alloy.
In addition, the rare earth compounds in the Mg-Zn-Al-Y alloy are mainly distributed at the grain boundaries, and the strengthening effect on the matrix is ​​not good

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A high-strength heat-resistant Mg-Zn-Al-Y-Sb magnesium alloy, the components of which include: 2-4wt.% Zn, 2-4wt.% Al, 0.5-2wt.% Y, 0.2-1wt.% Sb, The total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02wt.%, and the balance is Mg.

[0031] The wt.% refers to the percentage of the components in the total mass of the configured alloy, and the total mass is the sum of the mass of Mg, Zn, Al, Sb and Mg-Y master alloy.

[0032] Its preparation method is divided into two stages of smelting and heat treatment process:

[0033] Among them, the melting process is in SF 6 and CO 2 Under the condition of mixed gas protection, the steps are as follows:

[0034] (1) Baking material: Weigh pure Mg, pure Zn, pure Al, pure Sb, and Mg-Y master alloy respectively, and then preheat all the above-mentioned raw materials for more than 3 hours to reach 180-250°C for drying;

[0035] (2) Melting Mg: putting the dried Mg into a crucible resistance furnace to melt to form m...

Embodiment 2

[0044] A high-strength heat-resistant Mg-Zn-Al-Y-Sb magnesium alloy, the mass percentage of its components is: 2wt.% Zn, 2wt.% Al, 0.5wt.% Y, 0.2wt.% Sb, impurity element Si The total amount of , Fe, Cu and Ni is 0.01wt.%, and Mg is 95.29wt.%.

[0045] The preparation method of the high-strength heat-resistant Mg-Zn-Al-Y-Sb magnesium alloy is as follows:

[0046] First, the smelting process is carried out, and the entire smelting process is carried out in SF 6 and CO 2 Under the condition of mixed gas protection, specifically:

[0047] (1) Weigh pure Mg, pure Zn, pure Al, Mg-Y master alloy and pure Sb respectively. Then, preheat all the above-mentioned raw materials for more than 3 hours to reach 180°C for drying.

[0048] (2) Put the dried pure Mg into the SF 6 / CO 2 Melt in a gas shielded crucible resistance furnace. When the temperature of the molten magnesium reaches 700°C, 2wt.% pure Zn is added.

[0049] (3) When the melt temperature rises to 700° C. after pure Z...

Embodiment 3

[0057] The components and mass percentages of the high-strength heat-resistant Mg-Zn-Al-Y-Sb magnesium alloy are: 3wt.% Zn, 3wt.% Al, 1wt.% Y, 0.5wt.% Sb, impurity elements Si, Fe, The total amount of Cu and Ni is 0.015 wt.%, and Mg is 92.485 wt.%.

[0058] The preparation method of the high-strength heat-resistant Mg-Zn-Al-Y-Sb magnesium alloy is as follows:

[0059] First, the smelting process is carried out, and the entire smelting process is carried out in SF 6 and CO 2 Under the condition of mixed gas protection, specifically:

[0060] (1) Weigh pure Mg, pure Zn, pure Al, Mg-Y master alloy and pure Sb respectively. Then, preheat all the above-mentioned raw materials for more than 3 hours to reach 200° C. for drying.

[0061] (2) Put the dried pure Mg into the SF 6 / CO 2 Melt in a gas shielded crucible resistance furnace. After the magnesium liquid temperature reaches 720 ℃, add 3wt.% pure Zn.

[0062] (3) When the melt temperature rises to 720°C after pure Zn is m...

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Abstract

The invention relates to the technical field of magnesium alloy materials, in particular to a high-strength and heat-resistance Mg-Zn-Al-Y-Sb magnesium alloy and a preparation method thereof. The high-strength and heat-resistance Mg-Zn-Al-Y-Sb magnesium alloy comprises the following components: 2-4 wt.% of Zn, 2-4 wt.% of Al, 0.5-2 wt.% of Y, 0.2-1 wt.% of Sb, the total quantity of impurity elements Si, Fe, Cu and Ni less than 0.02 wt.%, and the balance of Mg. The preparation method of the high-strength and heat-resistance Mg-Zn-Al-Y-Sb magnesium alloy comprises two processes of smelting and heat treatment, wherein the smelting process comprises the steps of material baking, Mg smelting, Zn and Al adding, Y adding, Sb adding, refining and casting; and the heat treatment process comprises solid solution treatment and aging. The Sb elements with a certain mass are added in a Mg-Zn-Al-Y alloy, so that the casting structure of the alloy is effectively improved, and grains are refined; anda compact second phase with high melting point and high heat stability is formed, so that the room-temperature and high-temperature mechanical performances of the alloy are improved.

Description

technical field [0001] The invention relates to the technical field of magnesium alloy materials, in particular to a high-strength heat-resistant magnesium alloy added with Zn, Al, Y and Sb elements. Background technique [0002] Magnesium alloy has the advantages of low density, wide range of sources, high specific strength and specific stiffness, etc., and is known as "the green engineering material of the 21st century". Wide range of potential applications. At present, a major problem limiting the application of magnesium alloys is that their strength is low, which is difficult to meet the requirements of engineering applications. Therefore, the development of new high-strength magnesium alloys has very important value. [0003] Al is a commonly used alloying element in magnesium-zinc alloys. The ternary phase formed by the combination of Al, Mg and Zn is the main strengthening phase in the aging process. Mg-Zn-Al alloys have the advantages of low cost and good high-te...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/04C22C23/02C22C23/00C22C1/03C22C1/06C22F1/06
CPCC22C23/04C22C1/03C22C1/06C22C23/00C22C23/02C22F1/02C22F1/06
Inventor 徐文婷张扬卢雅琳
Owner JIANGSU UNIV OF TECH
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