Rare-earth magnesium alloy and preparation method thereof

A rare-earth magnesium and alloy technology, applied in the field of rare-earth magnesium alloys, can solve the problems of insufficient heat resistance of alloys, great influence on the performance of rare-earth magnesium alloys, and difficulty in control, and achieve good comprehensive mechanical properties, stable performance, good plastic effect

Inactive Publication Date: 2009-09-16
HENAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

So far, there are mainly the following deficiencies in the design, preparation and application of rare earth magnesium alloys: first, the content of rare earth elements has a great influence on the properties of the final rare earth magnesium alloy, which is difficult to control, and too little rare earth content is not enough In order to improve the heat resistance of the alloy, excessive rare earth content will cause inclusions due to the reaction of rare earth with oxygen and hydrogen, which will easily cause thermal cracking in the casting process; secondly, there are many rare earth elements to choose from, and the rare earth elements The interaction between them is relatively complex. In contrast, the research on this is relatively insufficient. At present, there are few types of heat-resistant rare earth magnesium alloys for practical application, and their high-temperature tensile strength and other properties cannot fully meet their application in aviation. Requirements in aerospace, military, automotive and other industries

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The rare earth magnesium alloy of the present embodiment is made up of the following components by mass percentage: 6% Al, 0.6% Y, 0.3% Nd, 3% Gd, the total amount of impurity elements Fe, Cu and Ni is less than 0.02%, and the balance is Mg. The total rare earth content is 3.9%.

[0027] The preparation method of the rare earth magnesium alloy of the present embodiment is:

[0028] The alloy is prepared according to the above-mentioned ratio, and is smelted in a medium-frequency induction furnace and a high-purity graphite crucible. Preheat the magnesium, aluminum and intermediate alloys Mg-Nd, Mg-Y, Mg-Gd to 150°C, and the steel sprue cup to 600°C for later use; then put the magnesium and aluminum into the preheated to 500°C About the Crucible, in SF 6 +CO 2 Under the protection of mixed gas, heat quickly with high power. After the magnesium and aluminum are melted, add the master alloy Mg-Y, Mg-Nd, Mg-Gd at 740°C. When the temperature of the molten magnesium rise...

Embodiment 2

[0032] The rare earth magnesium alloy of this embodiment is made up of the following components by mass percentage: 5.5% Al, 1.4% Y, 0.8% Nd, 4.8% Gd, the total amount of impurity elements Fe, Cu and Ni is less than 0.02%, and the balance is Mg. The total rare earth content is 7%.

[0033] The preparation method of the rare earth magnesium alloy of the present embodiment is:

[0034] The alloy is prepared according to the above-mentioned ratio, and is smelted in a medium-frequency induction furnace and a high-purity graphite crucible. Preheat magnesium, aluminum and intermediate alloys Mg-Nd, Mg-Y, Mg-Gd to 130°C, and steel sprue cup to 500°C for later use; then put magnesium and aluminum in About the Crucible, in SF 6 +CO 2 Under the protection of mixed gas, heat quickly with high power. After the magnesium and aluminum are melted, add the master alloy Mg-Y, Mg-Nd, Mg-Gd at 730°C. When the temperature rises to 770°C, turn off the main control circuit and let it stand sti...

Embodiment 3

[0038] The rare earth magnesium alloy of this embodiment is made up of the following components by mass percentage: 5% Al, 2.4% Y, 1.2% Nd, 1.2% Gd, the total amount of impurity elements Fe, Cu and Ni is less than 0.02%, and the balance is Mg. The total rare earth content is 4.8%.

[0039] The preparation method of the rare earth magnesium alloy of the present embodiment is:

[0040] The alloy is prepared according to the above-mentioned ratio, and is smelted in a medium-frequency induction furnace and a high-purity graphite crucible. Preheat magnesium, aluminum and intermediate alloys Mg-Nd, Mg-Y, Mg-Gd to 120°C, and steel sprue cup to 500°C for later use; then put magnesium and aluminum into About The Crucible, in SF 6 +CO 2 Under the protection of mixed gas, heat quickly with high power. After the magnesium and aluminum are melted, add the master alloy Mg-Y, Mg-Nd, Mg-Gd at 720°C. When the temperature rises to 775°C, turn off the main control circuit and let it stand s...

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Abstract

The invention discloses a rare-earth magnesium alloy, consisting of the following compositions in percentage by weight: 5 to 6 percent of Al, 0.6 to 2.4 percent of Y, 0.3 to 1.2 percent of Nd, 1.2 to 4.8 percent of Gd, less than 0.02 percent of gross amount of impurity elements, namely Fe, Cu and Ni, and the balance being Mg. The invention also discloses a method for preparing the rare-earth magnesium alloy. The rare-earth magnesium alloy Mg-Al-Y-Nd-Gd has excellent comprehensive mechanical performance, has the characteristics of high strength, good plastic property and relative stability of each performance after thermal treatment, and can meet the requirement of the alloy used in aero-space, weaponry, automobile and other fields.

Description

technical field [0001] The invention relates to a rare earth magnesium alloy, and also relates to a preparation method of the rare earth magnesium alloy. Background technique [0002] Magnesium is the lightest metal structure material, and it is used more and more in automobiles. For every 100Kg of weight loss in automobiles, the fuel economy will be reduced by 0.5L per 100Km, and exhaust emissions will be reduced. Therefore, the research and development of magnesium alloys is of great importance for energy conservation and environmental pollution control. Significance. However, because the poor strength and heat resistance of magnesium alloys seriously hinders its application in aerospace, military, automobile and other industries, improving the strength and heat resistance of magnesium alloys is an important issue for the development of magnesium alloy materials. [0003] The development of existing heat-resistant magnesium alloys mainly starts with restricting dislocatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/02C22C23/06C22C1/03B22D21/04C22F1/06
Inventor 李全安李建弘张兴渊李克杰张清
Owner HENAN UNIV OF SCI & TECH
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