A kind of multi-element rare earth magnesium alloy and preparation method thereof

A rare earth magnesium and alloy technology is applied in the field of metal materials, which can solve the problems of insufficient heat resistance and low strength, and achieve the effects of stable high temperature performance, broad application prospects, and high high temperature tensile strength.

Active Publication Date: 2015-12-23
HENAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The current commercial heat-resistant magnesium alloys such as WE43 have the main disadvantages that the heat resistance is not stable enough, and the strength drops more at high temperatures, which cannot fully meet the requirements of aerospace, military, automobile and other industries in a wide temperature range. Higher requirements for strength when used at 200°C-300°C

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  • A kind of multi-element rare earth magnesium alloy and preparation method thereof

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Effect test

Embodiment 1

[0026] The multi-component rare earth magnesium alloy of this embodiment is composed of the following components in mass percentage: 6%Gd, 3%Y, 1%Nd, 1%Sm, 0.4%Sb, and the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02%, the balance is Mg. The sum of the mass percentages of Gd, Y, Nd, and Sm is 11%.

[0027] The preparation method of the multi-element rare earth magnesium alloy of the present embodiment comprises the following steps:

[0028] 1) Preheat Mg, Sb, master alloys Mg-Gd, Mg-Y, Mg-Nd and Mg-Sm to 190°C;

[0029] 2) Put Mg and Sb into a crucible preheated to 500 °C, in CO 2 +SF 6 Under the protection of mixed gas, heat and melt quickly with high power, continue to stir, add master alloys Mg-Gd, Mg-Y, Mg-Nd and Mg-Sm at 730°C, heat and melt slowly with low power;

[0030] 3) After the master alloy is melted, remove the scum on the surface, keep stirring, raise the temperature to 780°C and keep it for 10 minutes to obtain the mixed solution; ...

Embodiment 2

[0034] The multi-component rare earth magnesium alloy of this embodiment is composed of the following components in mass percentage: 4%Gd, 2%Y, 2.5%Nd, 1.5%Sm, 0.8%Sb, and the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02%, the balance is Mg. The sum of the mass percentages of Gd, Y, Nd, and Sm is 10%.

[0035] The preparation method of the multi-element rare earth magnesium alloy of the present embodiment comprises the following steps:

[0036] 1) Preheat Mg, Sb, master alloys Mg-Gd, Mg-Y, Mg-Nd and Mg-Sm to 220°C;

[0037] 2) Put Mg and Sb into a crucible preheated to 500 °C, in CO 2 +SF 6 Under the protection of mixed gas, heat and melt quickly with high power, continue to stir, add master alloys Mg-Gd, Mg-Y, Mg-Nd and Mg-Sm at 740 ° C, and slowly heat and melt with low power;

[0038] 3) After the master alloy is melted, remove the scum on the surface, keep stirring, raise the temperature to 770°C and keep it for 10 minutes to obtain the mixed s...

Embodiment 3

[0042] The multi-component rare earth magnesium alloy of this embodiment is composed of the following components in mass percentage: 2%Gd, 2.5%Y, 2%Nd, 0.5%Sm, 0.6%Sb, and the total amount of impurity elements Si, Fe, Cu and Ni is less than 0.02%, the balance is Mg. The sum of the mass percentages of Gd, Y, Nd, and Sm is 7%.

[0043] The preparation method of the multi-element rare earth magnesium alloy of the present embodiment comprises the following steps:

[0044] 1) Preheat Mg, Sb, master alloys Mg-Gd, Mg-Y, Mg-Nd and Mg-Sm to 150°C;

[0045] 2) Put Mg and Sb into a crucible preheated to 500 °C, in CO 2 +SF 6 Under the protection of mixed gas, heat and melt quickly with high power, continue to stir, add master alloys Mg-Gd, Mg-Y, Mg-Nd and Mg-Sm at 720 ° C, and slowly heat and melt with low power;

[0046] 3) After the master alloy is melted, remove the scum on the surface, continue to stir, raise the temperature to 775°C and keep it for 10 minutes to obtain the mixed...

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Abstract

The invention discloses a multielement rare-earth magnesium alloy and a preparation method thereof. The multielement rare-earth magnesium alloy comprises the following components in percentage by mass: 2%-6% of Gd, 2%-3% of Y, 1%-2.5% of Nd, 0.5-1.5% of Sm, 0.4%-0.8% of Sb, less than 0.02% of total impurity elements, namely Si, Fe, Cu and Ni, and the balance of Mg. The multielement rare-earth magnesium alloy disclosed by the invention has the composition of Mg-Gd-Y-Nd-Sm-Sb, and has high high-temperature tensile strength and stable high-temperature performance as well as an abnormal temperature effect in the range from a room temperature to 250 DEG C. Compared with a commercial heat-resisting magnesium alloy WE54, the multielement rare-earth magnesium alloy has higher high-temperature tensile strength and operating temperature and has wide application prospect in fields such as aerospace, automobile industries and weaponry.

Description

technical field [0001] The invention belongs to the technical field of metal materials, and in particular relates to a multi-element rare earth magnesium alloy and a preparation method thereof. Background technique [0002] Magnesium is the lightest metallic structural material and is increasingly used in automobiles. Every time a car loses 100Kg, it saves 0.5L of fuel per 100 kilometers and reduces exhaust emissions. Therefore, the research and development of magnesium alloys is of great significance for saving energy and suppressing environmental pollution. However, the poor strength and heat resistance of magnesium alloys seriously hinder its application in aerospace, military, automobile and other industries. Therefore, improving the strength and heat resistance of magnesium alloys is an important issue for the development of magnesium alloy materials. [0003] Existing heat-resistant magnesium alloys mainly start with restricting dislocation movement and strengthening ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C23/06
Inventor 李全安付三玲张清陈君刘文健陈志宋晓杰
Owner HENAN UNIV OF SCI & TECH
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